Seamonkey XPCOMGlueLoad error

Problem:

I updated Seamonkey on Linux Mint and it now won't launch. I am running a 64-bit version of Linux Mint.

In terminal, I tried to run Seamonkey but got an error similar to:

$ /path/to/seamonkey/seamonkey

XPCOMGlueLoad error for file /path/to/seamonkey/libmozgtk.so:
libgtk-3.so.0: cannot open shared object file: No such file or directory
Couldn't load XPCOM.

When checking, I do have GTK 3:

$ locate libgtk-3.so.0

/usr/lib/x86_64-linux-gnu/libgtk-3.so.0
/usr/lib/x86_64-linux-gnu/libgtk-3.so.0.1800.9

Solution:

It may be that you're attempting to run a 32-bit version of Seamonkey on 64-bit Linux Mint. The default Seamonkey download from Mozilla as of Jan 2018 is the 32-bit version.

You can find the 64-bit version in their releases page: http://archive.mozilla.org/pub/seamonkey/releases/

For example, for 2.49.1:

Notes:

This solution worked for Seamonkey 2.49.1 running on 64-bit Linux Mint 18.1 Serena as of Jan 2018. Your mileage may vary with other versions and configurations.

Also for the system tested, the auto-update is not an issue because this browser will only be used on a local network. (You'll see the note from Mozilla when you launch the browser... at least for version 2.49.1). Keep this in mind if your situation is different and you need a browser that reliably auto-updates.

References:

http://archive.mozilla.org/pub/seamonkey/releases/ http://forums.mozillazine.org/viewtopic.php?f=40&t=3005417

How to change Ubuntu timezone to UTC

Problem:

How can I change my timezone to UTC in Ubuntu?

Solution:

1. In a terminal window type:

   sudo dpkg-reconfigure tzdata
   

2. Then select "None of the above":
   
3. After that, select "UTC":
   

If all goes well then the "date" command should show the date and time in UTC.

References:

• https://wiki.debian.org/TimeZoneChanges
• https://www.computerhope.com/unix/udate.htm

Run gpsfeed+ in Lubuntu 16.04

Problem:

I would like to run gpsfeed+ in Lubuntu 16.04.

I am running Lubuntu in VirtualBox. I want to output to guest COM1, and send this feed to a physical serial port on COM6 on my host machine.

Solution:

To run first time:

1. download the gpsfeed+.tcl script
2. open terminal
3. install "wish" (in terminal: sudo apt-get install tk)
4. install "libudp-tcl" (in terminal: sudo apt-get install libudp-tcl)
5. (in terminal, navigate to folder where gpsfeed+.tcl script is)
6. run gpsfeed+.tcl script (in terminal: wish gpsfeed+.tcl)

To output to COM1 in Lubuntu VirtualBox guest:

1. open VirtualBox settings for your guest machine
2. navigate to "serial ports" and enable COM1
3. to send the guest COM1 to a host serial port, configure port mode to send to host (for instance, to pipe to COM6 on a Windows host, use the settings in the screenshot below)
4. in gpsfeed+: go to Connection->Serial/IP, and set Port to "/dev/ttyS0" (see this stack exchange question on how to find your serial ports in Linux)
5. if needed, you may need to give read/write privileges to ttyS0 in terminal (make sure you know the implications first, or google them). One way is to add your user to the dialout group: "sudo usermod -G dialout -a (your username here)"
6. if all works then you should see the NMEA sentences being sent to your serial port after starting the simulation in gpsfeed+

VirtualBox settings to enable COM1 in guest and send to COM6 on host:

Gpsfeed+ setting to send to COM1 in VirtualBox Lubuntu:

Notes:

These instructions were found to work using a Windows 10 host, VirtualBox 5.1.30, Lubuntu 16.04.1 32-bit, and gpsfeed+ v0.58. A physical serial port exists on COM6 on the host machine. With other settings, your mileage may vary.

References:

• https://sourceforge.net/projects/gpsfeed/
• https://www.tcl.tk/man/tcl/UserCmd/wish.htm
• https://superuser.com/questions/131044/how-do-i-know-which-dev-ttys-is-my-serial-port

VirtualBox OS X Host Ubuntu Guest - USB device captured but not mounting/showing - One workaround

Problem:

I am using VirtualBox 4.2.x on OS X 10.7.x running an Ubuntu Guest. When I try to plug in a USB device, such as a USB drive, USB MIDI keyboard such as the Keystation 88-es, etc., VirtualBox shows the device as captured (with a checkmark in the USB devices list), yet Ubuntu can't find it. I've already tried things such as installing VirtualBox Guest Additions, setting proper user permissions, etc.

One Workaround:

If you've managed to mount and capture the USB device but it's still not showing, you've probably already made it past most How-To's Googling will offer. One bug fix that seems harder to come across is this: Set the number of virtual CPUs to 1.

Apparently after VirtualBox version 3.2.0, a bug has caused USB devices to not show up in some Linux-based guests when the number of virtual CPUs is set to more than 1.

If this obscure bug fix doesn't help, check out the references below to lots of other potential solutions to the USB-won't-mount problem.

Good luck!

Notes:

I realize that this post isn't complete, however it was this one somewhat obscure bug that caused many hours of attempted debugging and Googling until it was found. So to save others the trouble of finding it buried in a page full of instructions and fixes, I opted to highlight only this one bug, and link to other pages full of good solutions.

Hopefully by the time you've reached this blog page Oracle, VirtualBox, Apple, or some others have managed to fix the problem!

This workaround is version specific so your mileage may vary depending on the version of OS X, VirtualBox, VirtualBox Guest Additions, Linux, etc., that you are running.

References:

• http://davidoluwatimi.wordpress.com/2012/07/06/macosx-vbox-host-fix-ubuntu-usb-access/
• http://askubuntu.com/questions/140081/virtualbox-doesnt-recognize-usb
• http://www.madhuinc.com/windows-virtualbox-on-mac-os-x-not-recognizing-usb-devices/