Bug#801603: libgnome-desktop-3-12: gdm3 does not start after boot

[Andreas Henriksson]

Hello Michael Ott.

Thanks for your bug report.

On Mon, Oct 12, 2015 at 03:00:18PM +0200, Michael Ott wrote:
> Package: libgnome-desktop-3-12
> Version: 3.18.0-1
> Severity: important
> 
> Dear Maintainer,
> 
> I updated to libgnome-desktop-3-12 and restart the machine. But gdm3 crashed.
> I found this in syslog. With libgnome-desktop-3-10 it works.
[...]

The problem is that you're running a process which uses both
libgnome-desktop-3-10 and libgnome-desktop-3-12 at the same time (via
gir1.2-gnomedesktop-3.0). You should only use one of them at a time.

You installed from experimental and that means you need to handle
this transition on your own:
https://release.debian.org/transitions/html/auto-gnome-desktop3.html

Alternatively, you could downgrade gir1.2-gnomedesktop-3.0 to the
version in unstable until the transition is started.

We're currently discussing making it impossible for users to shoot
themselves in the foot in a future partial upgrade by prohibiting
partial upgrades. That would also prevent people blindly installing
things from experimental (as it would simply become impossible,
unless you've done your local rebuilds for the transition).

Regards,
Andreas Henriksson