Bug#909770: gdm3: Does not show the list of users and fails to start any session

[Sergio Villar Senin]

Package: gdm3
Version: 3.30.1-1
Severity: critical
Justification: breaks the whole system

Dear Maintainer,

   * What led up to the situation?

   The problem appeared on 3.30 and is still a problem in 3.30.1

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

     Boot the computer, then wait for the login screen (gdm) to appear.

   * What was the outcome of this action?

   The background of the plyumouth theme is shown but the list of
   users is not there as expected.

   * What outcome did you expect instead?

   The normal list of users from gdm.

Sometimes I press the power button and the system suspends to
RAM. When resuming then the gdm login screen is there, *but* if I try to
enter any session (GNOME) it does not work. The authentication seems
to succeed but then the screen becomes blank and there is no
possibility to even switch to the terminals via Ctr-Alt-Fx.

I'm now using lightdm which works fine.

-- System Information:
Debian Release: buster/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.18.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=gl_ES.UTF-8, LC_CTYPE=gl_ES.UTF-8 (charmap=UTF-8), LANGUAGE=gl_ES.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gdm3 depends on:
ii  accountsservice                       0.6.45-1
ii  adduser                               3.118
ii  dconf-cli                             0.30.0-1
ii  dconf-gsettings-backend               0.30.0-1
ii  debconf [debconf-2.0]                 1.5.69
ii  gir1.2-gdm-1.0                        3.30.1-1
ii  gnome-session [x-session-manager]     3.30.0-2
ii  gnome-session-bin                     3.30.0-2
ii  gnome-settings-daemon                 3.30.0-1
ii  gnome-shell                           3.30.0-2
ii  gnome-terminal [x-terminal-emulator]  3.30.0-1
ii  gsettings-desktop-schemas             3.28.1-1
ii  libaccountsservice0                   0.6.45-1
ii  libaudit1                             1:2.8.4-2
ii  libc6                                 2.27-6
ii  libcanberra-gtk3-0                    0.30-6
ii  libcanberra0                          0.30-6
ii  libgdk-pixbuf2.0-0                    2.38.0+dfsg-6
ii  libgdm1                               3.30.1-1
ii  libglib2.0-0                          2.58.1-2
ii  libglib2.0-bin                        2.58.1-2
ii  libgtk-3-0                            3.24.0-3
ii  libkeyutils1                          1.5.9-9.3
ii  libpam-modules                        1.1.8-3.8
ii  libpam-runtime                        1.1.8-3.8
ii  libpam-systemd                        239-9
ii  libpam0g                              1.1.8-3.8
ii  librsvg2-common                       2.40.20-3
ii  libselinux1                           2.8-1+b1
ii  libsystemd0                           239-9
ii  libwrap0                              7.6.q-27
ii  libx11-6                              2:1.6.6-1
ii  libxau6                               1:1.0.8-1+b2
ii  libxcb1                               1.13-3
ii  libxdmcp6                             1:1.1.2-3
ii  lsb-base                              9.20170808
ii  lxsession [x-session-manager]         0.5.3-2
ii  lxterminal [x-terminal-emulator]      0.3.2-1
ii  mutter [x-window-manager]             3.30.0-1
ii  openbox [x-window-manager]            3.6.1-7
ii  policykit-1                           0.105-21
ii  procps                                2:3.3.15-2
ii  ucf                                   3.0038
ii  x11-common                            1:7.7+19
ii  x11-xserver-utils                     7.7+8
ii  xterm [x-terminal-emulator]           337-1

Versions of packages gdm3 recommends:
ii  at-spi2-core    2.30.0-2
ii  desktop-base    9.0.7
ii  x11-xkb-utils   7.7+4
ii  xserver-xephyr  2:1.20.1-3
ii  xserver-xorg    1:7.7+19
ii  zenity          3.28.1-1

Versions of packages gdm3 suggests:
ii  gnome-orca            3.28.1-3
pn  libpam-fprintd        <none>
ii  libpam-gnome-keyring  3.28.2-1

-- debconf information excluded