Adding existing user to a group in Ubuntu

Example below adds user timus to the group www-authors

$: sudo usermod -a -G www-authors timus

To add user timus to sudoers group, do:

$: sudo usermod -a -G sudo timus

Note:

• That for the sudo to take effect you have to logout and log back in.
• In Debian Buster (10.3), need to reboot for it to take effect

Tested on:
- Lubuntu (13.04)
- Ubuntu (12.04 - 13.04)
- Debian Buster (10.3)

References:
http://www.cyberciti.biz/faq/howto-linux-add-user-to-group/
http://askubuntu.com/questions/7477/how-can-i-add-a-new-user-as-sudoer-using-the-command-line

Lubuntu 18.04 minimal installation does not include high contrast theme

I really like the trend in Ubuntu and derivatives for offering minimal installation in 18.04. Lubuntu offered that option but it still includes a lot of applications that I don't really need, for example it included gnumeric, Abiword, etc. I am hoping that future versions will be more streamlined.

Anyway, I also sometimes use high contrast theme but this is not installed by the default. To fix this do:

sudo apt install gnome-accessibility-themes

Ubuntu 17.04 minimal Lubuntu install

Lubuntu is already pretty lightweight but still comes with a lot of applications i don't need. I need a machine that is pretty clean, with just the bare bones with GUI capabilities.

Start with netinstall iso, do text based install with minimal options, then do:

$ sudo apt update
$ sudo apt upgrade
$ sudo tasksel install lubuntu-core
$ sudo reboot

Add browser, I like Chromium, install it like:

$ sudo apt install chromium-browser

Light Docker Settings is not working on using light install, so let us fix it, do:

$ sudo apt install python-gi

I like "Customize Look and Feel" (lxappearance) for adjusting LXDE, to install, do:

$ sudo apt install lxappearance

Additional packages to install, do:

$ sudo apt install xfonts-terminus

HowTo: Install wxPython in Lubuntu

How to install wxPython in Lubuntu (13.04)

$: sudo apt-get install python-wxgtk2.8 python-wxtools wx2.8-doc wx2.8-examples wx2.8-headers wx2.8-i18n

Applicable to:

• Ubuntu
• Kubuntu
• Linux Mint
• Debian
• Other Debian derivatives

HowTo: Create new user in Lubuntu

How to create new user in Lubuntu from the console (applicable to Ubuntu/Debian/Debian derivatives)

$: sudo adduser new_user_name

Reference:
http://www.howtogeek.com/howto/ubuntu/add-a-user-on-ubuntu-server/

HowTo: Delete user in Lubuntu

How to delete a user in Lubuntu (applicable to Ubuntu/Debian/Debian derivative)

$: sudo deluser user_to_delete

Reference:
http://manpages.ubuntu.com/manpages/hardy/man8/deluser.8.html

Fixing staf: error while loading shared libraries: libSTAF.so: cannot open shared object file: No such file or directory

 Assuming you have installed STAF in Lubuntu (13.04 in my case), running staf local ping ping you may observe the following error:

staf: error while loading shared libraries: libSTAF.so: cannot open shared object file: No such file or directory

To fix this, modify/add LD_LIBRARY_PATH to ~/.bashrc like:

export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/usr/local/staf/lib"

Starting STAF for given user on logon in Lubuntu

One way of starting STAF in Lubuntu for a given user is to edit ~/.profile, thus say add the following line towards the end of the file.

/usr/local/staf/startSTAFProc.sh

Set Lubuntu to autologon

To set Lubuntu (tested using 13.04 minimal install) to auto-logon, change /etc/lightdm/lightdm.conf, see below for samle cofiguration.

[SeatDefaults]
autologin-user=timus
autologin-timeout=0
user-session=Lubuntu
greeter-session=lightdm-gtk-greeter

References:
http://ubuntuforums.org/showthread.php?t=1472113