Bug#684432: SELinux is the Reason

[Laurent Bigonville]

Le Tue, 6 Nov 2012 09:59:05 +1100,
paul.szabo at sydney.edu.au a écrit :

> > ... the reason was identified to be pam_selinux.so plugged through
> > /etc/pam.d/gdm3-autologin ...
> 
> I do not use autologin. Instead I commented out the selinux lines
> in /etc/pam.d/gdm3 and now the very first gdmgreeter (after reboot)
> works. Thanks!

The real fix for this issue, is to properly set the security context on
the /usr/sbin/gdm3 executable.

-rwxr-xr-x. 1 root root system_u:object_r:xdm_exec_t:s0 263592 oct 20 17:53 /usr/sbin/gdm3

You should check that you have at least the
package selinux-policy-default (2:2.20110726-11) installed and relabel
your filesystem (touch /.autorelabel && reboot).

Laurent Bigonville