Bug#850291: gdm3: does not work without gnome-session

[Daniel Gnoutcheff]

Package: gdm3
Version: 3.22.1-1
Severity: normal

If I try to run gdm3 while gnome-session is not installed, the greeter
will not come up.  It instead blanks and unblanks the screen repeatedly,
presumably as it keeps respawning the greeter.  Installing gnome-session
fixes it.

It sounds like gnome-session-bin was supposed to be sufficient, but
apparently it isn't at the moment.

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

Kernel: Linux 4.8.0-2-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gdm3 depends on:
ii  accountsservice                       0.6.40-4
ii  adduser                               3.115
ii  dconf-cli                             0.26.0-2
ii  dconf-gsettings-backend               0.26.0-2
ii  debconf [debconf-2.0]                 1.5.59
ii  gir1.2-gdm-1.0                        3.22.1-1
ii  gnome-session-bin                     3.22.2-1
ii  gnome-settings-daemon                 3.22.1-1
ii  gnome-shell                           3.22.2-1
ii  gsettings-desktop-schemas             3.22.0-1
ii  libaccountsservice0                   0.6.40-4
ii  libaudit1                             1:2.6.7-1
ii  libc6                                 2.24-8
ii  libcanberra-gtk3-0                    0.30-3
ii  libcanberra0                          0.30-3
ii  libgdk-pixbuf2.0-0                    2.36.2-1
ii  libgdm1                               3.22.1-1
ii  libglib2.0-0                          2.50.2-2
ii  libglib2.0-bin                        2.50.2-2
ii  libgtk-3-0                            3.22.5-1
ii  libkeyutils1                          1.5.9-9
ii  libpam-modules                        1.1.8-3.4
ii  libpam-runtime                        1.1.8-3.4
ii  libpam-systemd                        232-8
ii  libpam0g                              1.1.8-3.4
ii  librsvg2-common                       2.40.16-1
ii  libselinux1                           2.6-3
ii  libsystemd0                           232-8
ii  libwrap0                              7.6.q-25
ii  libx11-6                              2:1.6.4-2
ii  libxau6                               1:1.0.8-1
ii  libxdmcp6                             1:1.1.2-1.1
ii  lsb-base                              9.20161125
ii  mutter [x-window-manager]             3.22.2-2
ii  policykit-1                           0.105-17
ii  ucf                                   3.0036
ii  x11-common                            1:7.7+18
ii  x11-xserver-utils                     7.7+7
ii  xfce4-session [x-session-manager]     4.12.1-5
ii  xfce4-terminal [x-terminal-emulator]  0.8.1-1
ii  xfwm4 [x-window-manager]              4.12.3-3
ii  xterm [x-terminal-emulator]           327-2

Versions of packages gdm3 recommends:
ii  at-spi2-core    2.22.0-4
ii  desktop-base    8.0.2
ii  x11-xkb-utils   7.7+3
ii  xserver-xephyr  2:1.19.0-3
ii  xserver-xorg    1:7.7+18
ii  zenity          3.22.0-1

Versions of packages gdm3 suggests:
pn  gnome-orca            <none>
ii  libpam-gnome-keyring  3.20.0-3

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

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