BigBlueButton is a communication technology which is designed for online schooling that is accessible for everybody via web browser. With BigBlueButton, teacher can connect to students by voice/video call, live whiteboard, live presentation, collaborative text editing, and easily send them assignments in form of document files, all done without installing any application for everyone. It is a complete alternative to Zoom in the time of COVID-19 worldwide pandemic. It is free and open for everybody. This short tutorial explains the quick procedure for teacher to teach online in BigBlueButton. Happy teaching!

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This tutorial explains you to communicate with people using Jitsi Video Conference via the internet. I hope this short guide helps everyone in this time of worldwide COVID-19 pandemic.

Requirements

• 1) Web browser
• 2) Enough internet access
• 3) Earphone with microphone capability

Jitsi Advantages

• Gratis
• Instant (browser based), does not need additional application
• Universal, any device any operating system can use
• Video conference
• Voice conference
• Multiple participants
• Text chat
• Share screen in both ways
• Easy invite other person(s)
• Room administration (room password, first user is admin, kick, mute/unmute to participants)

When you use Shutter Screenshot Tool on Ubuntu 17.10 with GNOME 3.26+ desktop, every time you take a screenshot the result is broken. The screenshot taken is not desktop interface as normally it is, but, looks like a bunch of Shutter logos scattered in a picture. This is the problem if you run Shutter on Wayland and the one (unintentionally) causes it is your Ubuntu 17.10, because by default you login to Wayland and not Xorg on 17.10. How to solve it? The simplest solution is by logout once and select "Ubuntu on Xorg" on gear logo at login screen and login again.

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Before:



After:



Solution:

• Logout from Ubuntu session.
• You get the login screen with a small gear besides Login button.
• Click small gear and select "Ubuntu on Xorg".
• Login.
• Try to take screenshot with Shutter.

Note: if you are technically curious, read how Wayland and Xorg differ here https://wayland.freedesktop.org/architecture.html.

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This article is licensed under CC BY-SA 3.0.

If you somehow find your Linux system crashes, do not kill (pressing power button) the computer directly. Such hard kill may broke your hard disk drive or corrupt your data. When you are facing system hang or crash or freeze, you can use Linux special shortcut keys to restart or shutdown safely. It is actually something called Linux Magic SysRq Keys[1]. Do not use these shortcut keys unless you need it urgently. And you can use these shortcut keys on another Linux distro. 

Restart

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Alt + Printscreen + REISUB

It means hold the Alt and printscreen by right hand, then press R + E + I + S + U + B by left hand. Respectively, I show below explanation for each key.

1. R: take control the keyboard from X Server
2. E: send SIGTERM signal to all processess (prepare them to death[2]) except init
3. I: send SIGKILL signal to all processess (kill them[3]) except init
4. S: sync all mounted filesystem
5. U: unmount all filesystem and automatically sync them
6. B: reboot without unmounting and syncing filesystem
7. O: shutdown 

Hi readers! Today I'd like to write an old post on my Indonesian blog - TahuTEK.net - here. Although this is an old post, I think you can make use of it when you have a problem.

When you install application on Ubuntu, you may ever encounter this kind of error message:

"deluge-console : Depends: deluge-common (= 1.3.0-0ubuntu1) but 1.3.0-1~getdeb1 is to be installed"

The above error message appears when you have installed a newer version than the required dependencies. The error message tells that you have installed deluge-common version 1.3.0-1~getdeb1, but deluge-console (application you want to install) requires deluge-common version 1.3.0-0ubuntu1. The deluge common 1.3.0-1~getdeb1 can not be removed because one or many applications depend on it. So, how to resolve this problem? Well, you should downgrade the version of deluge-common to 1.3.0-0ubuntu1 so deluge-console can be installed and applications which require it still work (we hope :D).

To perform a downgrade action, simply type the following command:

• sudo apt-get install deluge-common=1.3.0-0ubuntu1

Please change the command above to match your need.

Hope it helps :)

Few days ago, I re-installed VLC which was removed accidentally. Suddenly, my laptop turned off because of my battery, so VLC was not installed correctly and caused a problem when running APT command with error message: "E: The package vlc needs to be reinstalled, but I can't find an archive for it.".