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passwd -l adds two "!" characters but usermod -U only removes one. WTF. http://unix.stackexchange.com/questions/109314/two-ways-to-lock-a-password-but-only-one-to-unlock
*** This bug has been marked as a duplicate of bug 864880 ***
Actually this is a bug in libuser - passwd manual page states that it adds only single ! with -l, but the libuser backend of passwd does otherwise.
Changing the duplciate target just to be precise. See also bug 853153, which is really the core issue in libuser, but the report specifically talks about (usermod -U). *** This bug has been marked as a duplicate of bug 951743 ***
Upps, sorry for not checking for duplicates carefully enough.