broken sudo?!?

[Henning Kilset Pedersen]

Hello!

Somehow I've managed to break the sudo functionality in Hoary. I can't
do sudo anything. And I can't run for instance Ubuntu Update from Gnome
since it depends on sudo.

The /etc/sudoers file is (seemingly) intact and untouched. I've run
visudo and just resaved the file, but nothing happens.

Has anybody seen this before and solved it?

Thanks!

Kind regards,
Henning Pedersen