Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I can log in with my password just fine, but when trying to use sudo to run commands or authenticating to install software, my password does not work and my account is an administrator account. Further more, when I try to change my password with "passwd" in recovery mode, I get "Authentication token manipulation error." I've just installed 12.04, so I'm not sure what I could've done to break the system.

share|improve this question
Related:… – Eliah Kagan Jun 19 '12 at 1:10
Are you able to run commands as root using pkexec instead of sudo? (You can try a harmless command like pkexec ls to see.) If so, what happen when you try to change your password using pkexec passwd $USER. [I'm posting this as a comment rather than an answer because it's more likely to reveal useful diagnostic information, than to actually solve the problem.] You can edit your question to add this information. (Unless it solves the problem; then comment about that and I'll repost this as an answer. But that will probably not happen, not quite yet.) – Eliah Kagan Jun 22 '12 at 3:16

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.