Redirect mail links to GMail on Ubuntu 18.04 using Desktop Webmail

Posted on 2018-10-02 by Earl C. Ruby III

My Ubuntu 18.04 box has Thunderbird installed as the default mail client. I was a Thunderbird user for years, but I currently spend most of my time using GMail, and when I click on a email mailto: link on a web page Ubuntu will load Thunderbird.

The documented fix is to go to Settings > Details > Default Applications and pick a different mail client. However, I don’t want a mail client at all, I want mail links to go to my default browser (Firefox, on this machine), load GMail, and open a to email “to” the name in the link.

The documented fix for that issue is to install the gnome-gmail package, but I don’t always use Gnome, so I installed Desktop Webmail instead.

If you want to try it, these are the steps:

Fire up Synaptic Package Manager
Install the desktop-webmail package
Go to Settings > Details > Default Applications and pick Desktop Webmail as your default mail client.

The next time you click a mailto: link Desktop Webmail will ask you what web mail service you want to use. Desktop Webmail currently supports Gmail, Hotmail, Yahoo and Zoho. Select Gmail and it’ll pop up a new email message using GMail, set the “to” address to the mailto: link, using your preferred browser.

Hope you found this useful.

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Adding a LUKS-encrypted iSCSI volume to Synology DS414 NAS and Ubuntu 15.04

Posted on 2015-08-23 by Earl C. Ruby III

I have an Ubuntu 15.04 “Vivid” workstation already set up with LUKS full disk encryption, and I have a Synology DS414 NAS with 12TB raw storage on my home network. I wanted to add a disk volume on the Synology DS414 that I could mount on the Ubuntu server, but NFS doesn’t support “at rest” encrypted file systems, and using EncFS over NFS seemed like the wrong way to go about it, so I decided to try setting up an iSCSI volume and encrypting it with LUKS. Using this type of setup, all data is encrypted both “on the wire” and “at rest”.

Log into the Synology Admin Panel and select Main Menu > Storage Manager:

Add an iSCSI LUN
- Set Thin Provisioning = No
- Advanced LUN Features = No
- Make the volume as big as you need
Add an iSCSI Target
- Use CHAP authentication
- Write down the login name and password you choose

On your Ubuntu box switch over to a root prompt:

sudo /bin/bash

Install the open-iscsi drivers. (Since I’m already running LUKS on my Ubuntu box I don’t need to install LUKS.)

apt-get install open-iscsi

Edit the conf file

vi /etc/iscsi/iscsid.conf

Edit these lines:

node.startup = automatic
node.session.auth.username = [CHAP user name on Synology box]
node.session.auth.password = [CHAP password on Synology box]

Restart the open-iscsi service:

service open-iscsi restart
service open-iscsi status

Start open-iscsi at boot time:

systemctl enable open-iscsi

Now find the name of the iSCSI target on the Synology box:

iscsiadm -m discovery -t st -p $SYNOLOGY_IP
iscsiadm -m node

The target name should look something like “iqn.2000-01.com.synology:boxname.target-1.62332311”

Still on the Ubuntu workstation, log into the iSCSI target:

iscsiadm -m node --targetname "$TARGET_NAME" --portal "$SYNOLOGY_IP:3260" --login

Look for new devices:

fdisk -l

At this point fdisk should show you a new block device which is the iSCSI disk volume on the Synology box. In my case it was /dev/sdd.

Partition the device. I made one big /dev/sdd1 partition, type 8e (Linux LVM):

fdisk /dev/sdd

Set up the device as a LUKS-encrypted device:

cryptsetup --verbose --verify-passphrase luksFormat /dev/sdd1

Open the LUKS volume:

cryptsetup luksOpen /dev/sdd1 backupiscsi

Create a physical volume from the LUKS volume:

pvcreate /dev/mapper/backupiscsi

Add that to a new volume group:

vgcreate ibackup /dev/mapper/backupiscsi

Create a logical volume within the volume group:

lvcreate -L 1800GB -n backupvol /dev/ibackup

Put a file system on the logical volume:

mkfs.ext4 /dev/ibackup/backupvol

Add the logical volume to /etc/fstab to mount it on startup:

# Synology iSCSI target LUN-1
/dev/ibackup/backupvol /mnt/backup ext4 defaults,nofail,nobootwait 0 6

Get the UUID of the iSCSI drive:

ls -l /dev/disk/by-uuid | grep sdd1

Add the UUID to /etc/crypttab to be automatically prompted for the decrypt passphrase when you boot up Ubuntu:

backupiscsi UUID=693568ca-9334-4c19-8b01-881f2247ae0d none luks

If you found this interesting, you might want to check out my article Adding an external encrypted drive with LVM to Ubuntu Linux.

Hope you found this useful.

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Click to stream .m3u files in Ubuntu

Posted on 2015-01-01 by Earl C. Ruby III

I just recently heard about CCMixter.org on FLOSS Weekly. CCMixter.org is a resource and collaborative space for musicians and remixers. They have thousands of music tracks which can be downloaded, remixed, sampled, or streamed.

I recently did a fresh install of Ubuntu on the computer I was using, and clicking on any of CCMixter’s streaming links caused a window to pop up asking me if I wanted to play the stream using Rhythmbox or “Other”. Selecting Rhythmbox popped up Rhythmbox, but it wouldn’t play the stream. Googling around a bit led me to discussions of Rhythmbox brokenness going back to 2008, so I took a different tack.

I fired up Synaptic Package Manager and installed the VLC Media Player.

Then I clicked the gear icon on Unity’s upper right menu bar, selected “About this Computer”, clicked Default Applications, and changed the default application for Music to “VLC Media Player.”

Now when I click on a link to an .m3u stream, Ubuntu sends the link to VLC, and the music starts to play.

Hope you find this useful.

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Bring Pidgin’s window into front focus when there’s an inbound IM

Posted on 2013-10-08 by Earl C. Ruby III

I was talking to a co-worker about Pidgin not coming into focus when there’s a new, inbound IM. The Pidgin window used to come into focus, front and center, when I was running Ubuntu/Gnome and when running OpenSUSE/KDE, but when I upgraded my office desktop to Ubuntu/Unity it stopped behaving this way. My co-worker noticed the same behavior with Fedora17/Gnome. A new IM would come in, but the Pidgin IM window would remain in the background, hidden, unseen and unread.

I thought “There has to be a setting that controls this,” and there is…

Bring up Pidgin’s Buddy List
Click Tools > Plugins
Locate the Message Notification plugin and highlight it
At the bottom of the Plugins window is a Configure Plugin button. Click it
Under Notification Methods check both Raise conversation window and Present conversation window
Click Close

That’s it. The next time someone IM’s you, your Pidgin Conversation will pop up in the center of your screen, in front of all of your other windows.

Hope you find this useful.

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Getting rid of self-resizing windows in Ubuntu Linux 12.04

Posted on 2012-04-25 by Earl C. Ruby III

I’ve been using a pre-release “daily build” installation of Ubuntu 12.04 “Precise Pangolin” and noticed that current default for Gnome is for windows to resize themselves when you get close to the edge of the screen. I have two 22″ widescreen monitors and if I moved a window near the top edge it would maximize and fill the screen. If I moved a window to any edge Gnome would decide for me that what I “really” wanted was to enlarge the window to fill half the screen or do something else equally annoying. This might work well on a 10″ netbook screen, but on dual 22″ monitors it’s annoying as hell.

I tracked the problem down to a setting in Compiz, the screen compositing tool used by many Linux desktop environments, so if you’re using KDE or Unity with Compiz and you’re finding self-resizing windows irritating this fix should work for you as well.

To fix the problem you need to install the CompizConfig Settings Manager, so fire up Synaptic Package Manager and search for “compizconfig-settings-manager” and install it.

Once installed, if you’re using Gnome go to Applications > System Tools > Preferences and click “CompizConfig Settings Manager” to start the tool.

Scroll down to “Window Management.”

Uncheck “Place Windows”.

Leave “Grid” checked, but click the word “Grid” to get the Grid settings, then go to the Edges tab and change all Resize Actions to “None”.

Click Back.

Now your desktop will do what you tell it to do, rather than second-guessing you and doing something that you do not want.

One thing that you can now do (that you probably really don’t want) is to have the title bar (and it’s controls) move off-screen, which means you can’t move or resize the window unless you Alt-right-click on it. To fix that issue:

Check the “Put” plugin.

Click the word “Put” to bring up more options, go to the “Misc Options” tab, check “Avoid Offscreen”, click Back, then Close Window.

Hope you find this useful.

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Work-around for a locked-up Gnome 3 screen saver in Ubuntu 11.10

Posted on 2011-10-22 by Earl C. Ruby III

Gnome 3 has a screen saver (or more accurately a screen blanker — there are no pretty pictures) which is turned on by default and which password-protects (locks) your desktop by default when it activates. Unfortunately it’s been known to be buggy since it was released as part of Gnome 2, often refusing to unlock your screen and forcing you to reboot your system.

Users of the Gnome 3 desktop shell are reporting that for some video card and monitor combinations the Gnome 3 screen saver, after getting a key press / mouse movement that should prompt you for your password to unlock the screen:

Won’t unlock the screen at all.
Will display a mouse pointer but no password prompt.
Will display your original screen and all open documents (without prompting for a password) but will not allow you to click on anything, basically appearing as a locked-up desktop.

My setup reliably produces situation #3.

To unlock a locked-up desktop:

Ctrl-Alt-F1 will give you a text-based terminal login.
Log in with your user name and password.
Type: “killall gnome-screensaver”
Ctrl-Alt-F7 to get back to the (now unlocked) Gnome 3 desktop.

To replace the Gnome 3 screen saver with something less buggy:

Activities > Applications > Other > Synaptic Package Manager
Quick filter: xscreensaver
Right click ‘xscreensaver’ and select ‘Mark for Installation’
Click ‘Apply’ to install
Activities > Applications > System Tools > System Settings > Screen
Set “Turn off after” to ‘Never’ and “Lock” to ‘OFF’. This disables gnome-screensaver.
Activities > Applications > All > Screensaver
Follow the prompts to activate xscreensaver

If you try to uninstall gnome-screensaver Synaptic Package Manager will also want to uninstall gnome and gnome-core, which is a bad idea if you want to run Gnome. Gnome will always start gnome-screensaver even if you have it disabled, and xscreensaver won’t run if gnome-screensaver is running. So you basically need to kill gnome-screensaver after Gnome has started and then start xscreensaver. You can do this by adding a startup program:

Activities > Applications > Other > Startup Programs > Add
Name: “Screen Saver”
Command: “sleep 30; killall gnome-screensaver; sleep 5; xscreensaver”
Comment: “Kill gnome-screensaver, start xscreensaver”
Click “Add”

Hope you find this useful.

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Recovering from a lost connection when upgrading Ubuntu via ssh

Posted on 2011-05-30 by Earl C. Ruby III

I wanted to upgrade my desktop machine at work to the latest version of Ubuntu, but since it takes several hours to upgrade an Ubuntu host, and I have work to do during the day, I figured I could log into my workstation from home in using ssh and start the upgrade remotely.

So I logged into my workstation from home and ran:

> sudo apt-get install update-manager-core
> sudo do-release-upgrade

The upgrade script warned me that I was using ssh and asked if I was sure I wanted to continue. I said “Y”, and a little while later the upgrade manager was busy downloading upgrade packages.

I planned to check it a couple of times that night, answer any package upgrade questions that popped up, and then in the morning when I got to work the upgrade would be complete.

Of course what actually happened was that I got side-tracked onto some other problem that night, forgot about the upgrade in progress, and when I got to work the next day my workstation was in a state of limbo, with the upgrade halfway complete, waiting for me to answer some question on the screen — at my house.

Luckily the Ubuntu developers who created the ssh upgrade process run that upgrade inside of a screen session. As the screen pages states, “Screen is a full-screen window manager that multiplexes a physical terminal between several processes (typically interactive shells).”

So at work all I had to do was get the list of current screen sessions:

> sudo screen -list
There are screens on:
        9129.ubuntu-release-upgrade-screen-window       (05/17/2011 08:50:08 PM)        (Attached)
2 Sockets in /var/run/screen/S-root.

Invoke screen using the “-d -r sessionowner/[pid.tty.host]” flags:

> sudo screen -d -r root/9129.ubuntu-release-upgrade-screen-window

… and I could pull up the screen at work that had been displaying at my home. Once I answered the remaining questions about whether to keep my custom configuration files or use the new, packaged configuration files my workstation rebooted and the latest version of Ubuntu booted right up.

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Adding an external encrypted drive with LVM to Ubuntu Linux

Posted on 2010-02-10 by Earl C. Ruby III

I recently added an external eSATA drive to my home computer so I could back up critical data from my home network to one drive. I bought a Western Digital 1TB “green” drive and a Thermaltake external hard drive enclosure with eSATA and USB connectors.

Since my internal hard drives are encrypted it didn’t make sense to back up all of that data to an unencrypted external drive. I’d read Uwe Hermann’s excellent how-to article on disk encryption, but he didn’t cover setting up an LVM partition, which I always use so I can change drive volume sizes on the fly.

This is what I did to set up an external encrypted drive with LVM on an Ubuntu system:

Open a terminal
Get a root prompt:
```
sudo /bin/bash
```
Watch the system log:
```
tail -f /var/log/messages
```
Attach the external drive. The system log tells me that it was detected as /dev/sdc.
Check the drive for bad blocks (takes a couple of hours):
```
badblocks -c 10240 -s -w -t random -v /dev/sdc
```
Write random data to the entire drive. This step takes all night, but it ensures that never-written drive space can’t be differentiated from encrypted data if someone ever tries to crack the drive. (If you’re going to do this, you might as well do it right.)
```
shred -v -n 1 /dev/sdc
```

Create one big LVM partition on the drive using fdisk. Set up one big primary partition /dev/sdc1, set the tag to system id “8e” LVM, and write the changes to disk:

> fdisk /dev/sdc                                                                                                                                              
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel                                                                                                  
Building a new DOS disklabel with disk identifier 0xa6846916.                                                                                                                       
Changes will remain in memory only, until you decide to write them.                                                                                                                 
After that, of course, the previous content won't be recoverable.                                                                                                                   


The number of cylinders for this disk is set to 121575.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:               
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs                                                                                                                                 
   (e.g., DOS FDISK, OS/2 FDISK)                                                                                                                                                    
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)                                                                                                      
                                                                                                                                                                                    
Command (m for help): p                                                                                                                                            
                                                                                                                                                                                    
Disk /dev/sdc: 999.9 GB, 999989182464 bytes                                                                                                                                         
255 heads, 63 sectors/track, 121575 cylinders                                                                                                                                       
Units = cylinders of 16065 * 512 = 8225280 bytes                                                                                                                                    
Disk identifier: 0xa6846916                                                                                                                                                         
                                                                                                                                                                                    
   Device Boot      Start         End      Blocks   Id  System                                                                                                                      
                                                                                                                                                                                    
Command (m for help): n                                                                                                                                            
Command action                                                                                                                                                                      
   e   extended                                                                                                                                                                     
   p   primary partition (1-4)                                                                                                                                                      
p                                                                                                                                                                  
Partition number (1-4): 1                                                                                                                                          
First cylinder (1-121575, default 1): [ENTER]                                                                                                                      
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-121575, default 121575): [ENTER]
Using default value 121575

Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)

Command (m for help): p

Disk /dev/sdc: 999.9 GB, 999989182464 bytes
255 heads, 63 sectors/track, 121575 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xa6846916

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1      121575   976551156   8e  Linux LVM

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

Use cryptsetup to encrypt the drive:

cryptsetup --verbose --verify-passphrase luksFormat /dev/sdc1

Unlock the drive:

cryptsetup luksOpen /dev/sdc1 backupexternal

Create the LVM physical volume:
```
pvcreate /dev/mapper/backupexternal
```

Create the LVM volume group:

vgcreate xbackup /dev/mapper/backupexternal

Create a logical volume within the volume group:
```
lvcreate -L 500G -n backupvol /dev/xbackup
```
At this point you have a device named /dev/xbackup/backupvol, so create a filesystem on the logical volume:
```
mkfs.ext4 /dev/xbackup/backupvol
```

Mount the volume:

mount /dev/xbackup/backupvol /mnt/backup

To get the volume to mount automatically at boot time add this line to your /etc/fstab file:
```
/dev/xbackup/backupvol      /mnt/backup     ext4    defaults        0 5
```
To be prompted for the decryption key / passphrase at boot time first get the drive’s UUID:
```
ls -l /dev/disk/by-uuid
```
(In my example I use the UUID for /dev/sdc1)

Then add this line to the /etc/crypttab file:

backupexternal UUID=[the UUID of the drive] none luks

That’s it. You now have an external, encrypted hard drive with LVM installed. You’ve created one 500GB volume that uses half the disk, leaving 500GB free for other volumes, or for expanding the first volume.

Hope you find this useful.

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Installing Skype on Ubuntu 9.04 using Synaptic

Posted on 2009-07-13 by Earl C. Ruby III

Want to make free phone calls using Skype? Running Ubuntu 9.04? Want to make sure that Skype stays up-to-date with the latest security patches and updates once you install it? Here’s how:

On the Skype Download for Linux page Skype lists Ubuntu 7.04-8.04 as the only supported versions of Ubuntu. You can install Skype on Ubuntu 9.04, but when new updates or security fixes come out you won’t get an automatic update. If you want to make sure that your Skype installation stays up-to-date you should add skype.com as a valid software repository and install Skype from that. If you do this you’ll automatically get updates when they’re available.

To add skype.com as a repository:

Start up Synaptic Package Manager. (On Gnome go to System > Administration > Synaptic Package Manager)
Select Settings > Repositories
Click the Third-Party Software tab
Click Add
Enter “deb http://download.skype.com/linux/repos/debian/ stable non-free” as the APT line
Click the Reload button in the upper left-hand corner to download the list of available files from download.skype.com
Type “skype” in the Quick Search box and you should see Skype listed as an installable package
Mark it for installation and install

Skype should now appear on your Applications > Internet menu.

Update: At the time that I wrote this the instructions worked. However, it looks as if Skype has removed their apt repositories for 9.04. If you attempt to connect to http://download.skype.com/linux/repos/debian/ you’ll get a “Hi, this page is off limits” error message.

If you are running Ubuntu 10.04 or later you can get Skype directly from Canonical. See https://help.ubuntu.com/community/Skype for more info.

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Change your Skype availability status on Ubuntu via cron

Posted on 2008-10-10 by Earl C. Ruby III

I used Skype when it first came out and then stopped because there were only a few other people I knew who used it regularly. Since they were all in my local calling area, if I wanted to talk to any of them for free I could just use a phone.

I just started using it again — for work — to talk with customers and consultants who do not live in the Bay Area. However, I found that my Thursday telecommute days were causing problems: Skype would be running on my work computer and people trying to call me would get ring-no-answer because I was actually at home.

Turns out you can start and stop Skype via cron the same way you can start and stop Pidgin Instant Messenger via cron, you just need to set a few environment variables and it works great.

First create the script ~/bin/export_x_info which looks like this:

#!/bin/bash
# Export the dbus session address on startup so it can be used by cron
touch $HOME/.Xdbus
chmod 600 $HOME/.Xdbus
env | grep DBUS_SESSION_BUS_ADDRESS > $HOME/.Xdbus
echo 'export DBUS_SESSION_BUS_ADDRESS' >> $HOME/.Xdbus
# Export XAUTHORITY value on startup so it can be used by cron
env | grep XAUTHORITY >> $HOME/.Xdbus
echo 'export XAUTHORITY' >> $HOME/.Xdbus

Create this script, type chmod 700 ~/bin/export_x_info so you can execute it, then execute it, then add it to System > Preferences > Sessions > Startup Programs so it will execute every time you start your computer and record the latest session address and XAUTHORITY value.

This script creates a 4-line file ~/.Xdbus with the current session address and XAUTHORITY value. By sourcing this file in the crontab file your scripts can now use dbus to send messages to X-Windows applications. To start and stop Skype at work I added these lines to my work computer’s crontab file:

# Skype on/off
00 09 * * Mon,Tue,Wed,Fri source ~/.Xdbus; /usr/bin/skype &
30 17 * * Mon,Tue,Wed,Fri killall skype

On my home computer I have:

# Skype on/off
00 09 * * Thu source ~/.Xdbus; /usr/bin/skype &
30 17 * * Thu killall skype

So on Thursdays when I telecommute Skype is running at home, the rest of the week it’s running at my office, and at night it’s turned off so customers aren’t calling me in the middle of the night.

When Skype isn’t running other users see your status as “Offline”. When cron restarts Skype it starts up with the same status it had when the process was killed. I just leave my status set to “Online,” so when cron starts Skype it shows everyone that I’m online. When cron kills the Skype process at the end of the day my status changes to “Offline” and people can’t call me.

Hope you find this useful.

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