I would try booting into single user mode which should log you in as root. Then you should be able to grant yourself root permissions again. Please let us know what happens. Thanks in advance.
** Changed in: Ubuntu
Assignee: (unassigned) => Brian Murray
Status: Unconfirmed => Needs Info
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Feisty Fawn update loses access to root admin privelages
https://launchpad.net/bugs/92428
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