*** This bug is a duplicate of bug 432964 ***
https://bugs.launchpad.net/bugs/432964
Well, just have a look at bug 432964, but in short: remove the file
/etc/passwd.lock, /etc/shadow.lock or /etc/gshadow.lock.
** This bug has been marked a duplicate of bug 432964
System crash in guest session locks /etc/passwd forever
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[users-admin] Can't create new user accounts
https://bugs.launchpad.net/bugs/459474
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