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Possible Duplicate:
Authentication token manipulation error

I want to change my ubuntu 11.10 administrator account password but when i am about to do so, i get an error that "passwd:Manipulation Token Authentication Error" and then in the next statement get"passwd:password unchanged"...So can anyone help me out by finding a solution to this problem?

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marked as duplicate by Eliah Kagan, James Jul 29 '12 at 20:51

This question was marked as an exact duplicate of an existing question.

read this:… – maniat1k Feb 23 '12 at 9:43

In recent versions of Ubuntu, the filesystem is mounted as read-only, so you need to enter the follow command to get it to remount as read-write, which will allow you to make changes :

mount -o rw,remount /

Not doing this will cause that error.

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