Bug#740864: gdm3: Oops! Something has gone wrong! when using gdm3

[Mathieu Parent]

Package: gdm3
Version: 3.8.4-6
Severity: important

Dear Maintainer,

I have this problem since some time...

gdm3 is not usable and gives an "Ooops" message before showing the login form.

I have lipam-systemd installed (and as a side-note, pam_winbind). I
use systemd a pid=0. I have enabled the firewall.

As a workaround, I switched to lightdm, but session locking and user
switching doesn't work.

Some (maybe) relevant logs (/var/log/gdm3/:0-slave.log):
simple-slave[7137]: Failed to give slave programs access to the
display. Trying to proceed.
gdm-launch-environment][7158]:
pam_unix(gdm-launch-environment:session): session opened for user
Debian-gdm by (uid=0)
gdm-launch-environment][7158]:
pam_ck_connector(gdm-launch-environment:session): nox11 mode, ignoring
PAM_TTY :0
gdm-launch-environment][7158]:
pam_unix(gdm-launch-environment:session): session closed for user
Debian-gdm
gdm-simple-slave[7137]: GLib-GObject: g_object_ref: assertion
'object->ref_count > 0' failed
gdm-simple-slave[7137]: GLib-GObject: g_object_unref: assertion
'object->ref_count > 0' failed
gnome-session[4682]: dconf-CRITICAL: unable to create directory
'/run/user/49128/dconf': Permission non accordée.  dconf will not work
properly.


Regards

-- System Information:
Debian Release: jessie/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 3.12-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages gdm3 depends on:
ii  accountsservice                              0.6.34-2
ii  adduser                                      3.113+nmu3
ii  dconf-cli                                    0.18.0-1
ii  dconf-gsettings-backend                      0.18.0-1
ii  debconf [debconf-2.0]                        1.5.52
ii  gir1.2-gdm3                                  3.8.4-6
ii  gnome-session [x-session-manager]            3.8.4-3
ii  gnome-session-bin                            3.8.4-3
ii  gnome-session-flashback [x-session-manager]  3.8.0-2
ii  gnome-settings-daemon                        3.8.5-2
ii  gnome-shell                                  3.8.4-5+b1
ii  gnome-terminal [x-terminal-emulator]         3.10.1-1
ii  gsettings-desktop-schemas                    3.8.2-2
ii  libaccountsservice0                          0.6.34-2
ii  libatk1.0-0                                  2.10.0-2
ii  libaudit1                                    1:2.3.3-4
ii  libc6                                        2.17-97
ii  libcairo-gobject2                            1.12.16-2
ii  libcairo2                                    1.12.16-2
ii  libcanberra-gtk3-0                           0.30-2
ii  libcanberra0                                 0.30-2
ii  libgdk-pixbuf2.0-0                           2.30.5-1
ii  libgdm1                                      3.8.4-6
ii  libglib2.0-0                                 2.38.2-5
ii  libglib2.0-bin                               2.38.2-5
ii  libgtk-3-0                                   3.10.7-1
ii  libpam-modules                               1.1.8-2
ii  libpam-runtime                               1.1.8-2
ii  libpam-systemd                               204-7
ii  libpam0g                                     1.1.8-2
ii  libpango-1.0-0                               1.36.0-1+b1
ii  libpangocairo-1.0-0                          1.36.0-1+b1
ii  librsvg2-common                              2.40.0-1
ii  libselinux1                                  2.2.2-1
ii  libwrap0                                     7.6.q-25
ii  libx11-6                                     2:1.6.2-1
ii  libxau6                                      1:1.0.8-1
ii  libxdmcp6                                    1:1.1.1-1
ii  libxrandr2                                   2:1.4.2-1
ii  lsb-base                                     4.1+Debian12
ii  metacity [x-window-manager]                  1:2.34.13-1
ii  twm [x-window-manager]                       1:1.0.6-1
ii  upower                                       0.9.23-2+b1
ii  x11-common                                   1:7.7+6
ii  x11-xserver-utils                            7.7+2
ii  xfce4-session [x-session-manager]            4.10.1-5
ii  xfce4-terminal [x-terminal-emulator]         0.6.3-1
ii  xfwm4 [x-window-manager]                     4.10.1-2
ii  xterm [x-terminal-emulator]                  301-1

Versions of packages gdm3 recommends:
ii  at-spi2-core               2.10.2-2
ii  desktop-base               7.0.3
ii  gnome-icon-theme           3.10.0-1
ii  gnome-icon-theme-symbolic  3.10.1-1
ii  x11-xkb-utils              7.7+1
ii  xserver-xephyr             2:1.15.0-2
ii  xserver-xorg               1:7.7+6
ii  zenity                     3.8.0-1

Versions of packages gdm3 suggests:
ii  gnome-orca            3.4.2-2
ii  libpam-gnome-keyring  3.8.2-2+b1

-- debconf information:
* shared/default-x-display-manager: lightdm
  gdm3/daemon_name: /usr/sbin/gdm3