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I am running mandrake 10.1 with KDE 3.2.2. I don't know why this happened, but the "su" command just stopped working. I get the response:
su: cannot set groups: Operation not permitted
I can log into root initially, and then "su bob" and get into bob, but it will not let me back into root. Also, i can only get into other accounts if i am starting from root.
I think the problem might be a problem with the password recognition, since even if i create an account with a null password su will ask for one and then give me the same denial unless i am attempting to su as root.