[kwlug-disc] I'm "not in sudoers file."

[Chris Craig]

On 30 March 2017 at 03:34, Ronald Barnes <ron at ronaldbarnes.ca> wrote:

> usermod -G (--groups) to add user to new group(s) REQUIRES the -a (--append)
> option if one is not willing to manually specify all the groups the user is
> to be in as arguments to usermod.
>
> Apparently, it keeps you in your default group that matches your username
> though.

Using simply 'usermod -G' to add a user to a group is a very common
piece of misinformation. Personally I use 'gpasswd' to manage groups.
Adding a user to a group would be:
$ sudo gpasswd -a <user> <group>

> Anyone have a handy list of the default groups for a normal user on Ubuntu
> 16.04?

Even better, here's the list of groups you were added to when your
account was created:
$ sudo grep user-setup /var/log/installer/syslog

You could also create a throwaway user, and use 'groups' on their account.

This won't tell you any additional groups added by install scripts
(for cups, samba, etc), but they become apparent soon enough.