Bug#873199: gdm3 fails to open X sessions on the console and on X servers using xdmcp (Stretch 9.1)

[Laurent Bigonville]

tag 873199 + moreinfo
thanks

On Fri, 25 Aug 2017 15:07:07 +0200 Jean-Paul Bouchet 
<jean-paul.bouchet at inra.fr> wrote:
 > Dear Maintainer,

Hi, Bonjour,

 > A few months ago I met no difficulties to configure our debian Wheezy
 > server to manage X sessions with gdm3, on the console and an a set of X
 > servers (Windows PC with Cygwin/X) using xdmcp.
 > I was unable to retrieve this functionality after a dist-upgrade to
 > Jessie (cf. https://lists.debian.org/debian-user/2016/10/msg00437.html).
 > I hoped that Stretch could permit me to retrieve it. The dist-upgrade
 > from Jessie to Stretch was perfect but let unsolved our problems with 
gdm3.
 > May be does it work on a fresh install ? On my upgraded server it
 > doesn't and I fail to progress.
 > I don't know whether the problems are due to wrong file permissions
 > somewhere, wrong values for some parameters, or to problems on which I
 > can't get a grip on, or even to the gdm3 package.
 > They probably are not the same for the console and the xdmcp requests.
 > Thank you to have a look at these lines that I have tried to select 
for you.

Could you check if libpam-systemd is installed and enabled in 
common-session pam file?

Regarding the "/sys/fs/cgroup/cgmanager" error, could you check that 
pam_cgm.so is NOT enabled in any pam services?

You could use "pam-auth-update" to update the pam config files.

Regards,

Laurent Bigonville