[Bug 42712] Re: gdmsetup segfaults

[Pausanias]

I can confirm that the segfault was due to the absence of /etc/gdm/gdm
.conf-custom after playing around with xgl/compiz. The instructions on
the forums say that one should delete this file to disable xgl/compiz.
It appears as mentioned above that removing this file causes gdmsetup to
segfault. The solution is to restore the default /etc/gdm/gdm.conf-
custom and reboot (or restart gdm).

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gdmsetup segfaults
https://launchpad.net/bugs/42712