Ubuntu 11.10 and earlier
By default the
sudo group is not used in Ubuntu:
- the user created during installation belongs to
admin group, not
- no guide or manual I ever read advices to use the
- no one feels the need to use the
sudo group, because the
admin group can do all one needs.
Conversely, on Debian the group enabled in
/etc/sudoers is the
sudo group, and there is no
admin group. But the user created during installation is not put in that group, because Debian has the
root account enabled. You should do it explicitly, if you want to.
Also, Fedora is similar to Debian, having
root enabled and no default privileges for the user create during installation. But the administrative group configured in
/etc/sudoers is the more traditional group
In conclusion, I think there is no use for
sudo group in Ubuntu, simply it is a Debian heritage.