Comment 21 for bug 432964

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Milan Bouchet-Valat (nalimilan) wrote : Re: usermod fails: "cannot lock /etc/passwd"

Interesting. Could you report another bug about that crash in xserver-xorg? That's probably the place where the bug occurs. See https://wiki.ubuntu.com/X/Troubleshooting/Freeze.

This report can be kept to determine why crashing while a guest session is open will leave those files. That's a real issue on the long term - even if the system should not crash...