Regain Sudo rights after removing from admin group
I have been given a laptop with ubuntu 9.10 installed. it has only one User.
The problem is sudo is disabled and thus i cant use it to do anything. Reinstalling ubuntu is not an option as the institute im in current studying in has some net problems and i cannot download the newer OS (& i urgently need sudo). Also the person who has given me the laptop doesnt know anything about this. Please help.