I edited my /etc/sudoers file the other day to add timestamp_timeout=0 to cause sudo to ask for a password every time. I used visudo in sudo mode and when it came to saving it appeared to want to save the file as sudoers.tmp so I edited this to sudoers. Anyway some how may edit failed. I booted up into terminal and reedited and somehow lost all access to the sudo mode. I think the file ended up with the wrong permissions.
After a fresh install I don't want to mess this up again. So please, please tell me how to save it. Should I save as sudoers.tmp or sudoers? I presume a could have made a typo, but am assuming not.
Any help ideas would be greatly appreciated as I don't want to reinstall ubuntu and all the packages again.