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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.

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Related: askubuntu.com/questions/152793/… –  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

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