Default Groups For Admin User In Ubuntu 12.04?

[digiPixel]

On a laptop running Ubuntu 12.04 LTS I foolishly followed some instructions on adding a user to a secondary group. After executing the command (usermod) I can no longer use the sudo command. Should have followed my insticts after doing some reading of the man page for usermod where the a switch needs to be added before the G switch.

My Linux CLI knowledge is a bit rusty however I discovered via the groups command that my user is now only a member of 2 groups (incl the user's group). Only one user exists in the system since the OS was installed via a Net Install.

What are the default groups that an admin user is a member of in Ubuntu 12.04?

Made a mistake in creating this thread in the wrong group. This thread should be in the General Help group. Is there any way to move this thread?

[aysiu]

You should be in adm cdrom sudo dip plugdev lpadmin sambashare

[aysiu]

After executing the command (usermod) I can no longer use the sudo command.

You can fix that:
http://www.psychocats.net/ubuntu/fixsudo

[digiPixel]

You should be in adm cdrom sudo dip plugdev lpadmin sambashare

You can fix that:
http://www.psychocats.net/ubuntu/fixsudo

That did the trick, thanks. Will teach me to enter in a command without checking it first.

Now i'm wondering why Canonical decided to remove group management from User Accounts. Would have made adding a user to a new group less error prone.