Users, Groups, Owners and Attributes
In addition to the administrator user and another user setup in the installation, the administrator user may add other users through the command line or through the graphical user interface such as KDE's User application in the System Settings. The KDE settings do not allow to add groups to the user account, though.
The default groups setup by the Triskel installer for the administrator user "joe" are:
uid=1000(joe) gid=1000(joe) groups=1000(joe),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),100(users),107(lpadmin),116(sambashare)
The default groups for the user "jim" setup in the Triskel installer are:
uid=1001(jim) gid=1001(jim) groups=100(users),1001(jim)
To add a user "user3" to the system use the adduser command:
$ sudo adduser user3
A user may want to add other groups to their user such as libvirt which allows the user to use virtualization.
$ sudo usermod --append --groups libvirt joe
There are other groups associated with virtualization, such as kvm and libvirt-qemu but the administrator or other local users do not require to be added to these groups to do virtualization.
After adding a group to a user the user will need to logout of the session and log in again.
lpadmin group allows the user to add and manage a printer.
sudo group allows the user act as an administrator using the sudo command.
