SUDO Password Suddenly Stopped

Asked Sep 14 '16 at 18:12

Active Sep 14 '16 at 18:39

Viewed 41 times

So I am plugging along quite happily on my new Linux (Ubuntu) box when suddenly my root password has ceased to work. I get one of two errors:

"Your authentication was unsuccessful. Please try again." or
"___ is not in the sudoers file.'

This literally happened while I was using the computer. One minute it works fine, the next it doesn't. I can't edit the /usr/sbin/visudo file because sudo won't accept my password.

There has only ever been one user account on this computer and I have never changed a password. What can i do to fix it?

edited Sep 14 '16 at 18:39

Aaron

6,714

asked Sep 14 '16 at 18:12

dhp904

What is the output of terminal command id -Gn? – steeldriver Sep 14 '16 at 18:18
the only group listed is my username. – dhp904 Sep 14 '16 at 18:23
I am also trying to boot into recovery mode, but I don't get the normal menu, just a GRUB line. Sigh – dhp904 Sep 14 '16 at 18:25

SUDO Password Suddenly Stopped

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