ubuntu, I can no longer become root or have root rights
I installed ubuntu without ever being asked for a root password (afaik).
I created a user named t with password xxx.
I logged onto the system.
I was able to start a "root terminal" specifying t's password xxx.
I could never start a terminal and do a "su".
I used visudo to add t to the sudo users.
I changed the userid t to ts and the password from xxx to yyy.
- Now I can't start a root terminal - it says "child process failed -1".
- I can't sudo because the user t changed to ts and is no longer in the sudoers file.
- I can't "su root" from a terminal window - password fail with both password xxx and yyy.
I need root rights - and I am the only user of the machine, can anyone see a solution ?
The system is Ubuntu with Gnome.