Managing Groups

Check which groups you are in, and which are available:

1groups
2cat /etc/group
3column -ts: /etc/group
4grep $USER !$

Remove yourself from all groups, and add yourself back to only mail, audio, and your own group:

1sudo usermod --groups mail,audio,$USER

Add yourself to the docker group, if there is one:

1grep docker /etc/group
2sudo usermod --append --groups docker $USER

Add yourself to the games group:

1sudo usermod -aG games $USER

You are now legally permitted to play games.

The changes have not taken effect, so log into your own account again with su:

 1groups
 2grep audio /etc/group
 3
 4sudo usermod -aG audio $USER
 5groups
 6grep audio /etc/group
 7
 8su $USER
 9groups
10grep audio /etc/group