Comment 8 for bug 438561

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Max Bowsher (maxb) wrote : Re: package gdm 2.28.0-0ubuntu8 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

I just tried running 'dpkg --configure -a' from a text VT whilst gdm was still running, and it was fine. So it seems to be something about the postinst running inside a gnome-terminal that breaks things.