Bug#757081: gdm3 doesn't create /etc/systemd/system/display-manager.service under some circumstances.

[Angelescu Ovidiu]

Package: gdm3
Version: 3.12.2-2
Severity: important

Dear Maintainer,

   I have tried to install gnome in a virtual machine on a fresh cli install. 
   Install went fine but when restarting gdm3 was not started.Taking a look to the installed files
   I have discovered that /etc/systemd/system/display-manager.service link was 
   missing and systemd has reported that grapical.target is in use.
   I have started gdm3 from console and it worked.
   Please notice that gdm3 was the only display-manager installed.
   Since gdm3 was the only installed display manager I have expected that 
   after restart gdm3 to start gnome.
   In /etc/X11/default-display-manager file it was gdm3 present.
   
   It seems that gdm3-3.12-2 postinst 
   doesn't create /etc/systemd/system/display-manager.service link at first
   gdm3 install and gdm3 isn't started at reboot by systemd.
   
   I have downloaded gdm3-3.12-2 and tried a reinstall and ....
   after second gdm3 install  /etc/systemd/system/display-manager.service link
   was there and of course after reboot all was ok.
 
  It seems that gdm3 postinst creates /etc/systemd/system/display-manager.service
  link only after second gdm3 install.

   I have expected that gdm3 starts after first install and reboot.
   Thank you.

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

Kernel: Linux 3.15-8.towo-siduction-amd64 (SMP w/6 CPU cores; PREEMPT)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages gdm3 depends on:
ii  accountsservice                              0.6.37-3
ii  adduser                                      3.113+nmu3
ii  dconf-cli                                    0.20.0-2
ii  dconf-gsettings-backend                      0.20.0-2
ii  debconf [debconf-2.0]                        1.5.53
ii  gir1.2-gdm3                                  3.12.2-2
ii  gnome-session [x-session-manager]            3.12.1-3
ii  gnome-session-bin                            3.12.1-3
ii  gnome-session-flashback [x-session-manager]  3.8.0-3
ii  gnome-settings-daemon                        3.12.2-1
ii  gnome-shell                                  3.12.2-3
ii  gnome-terminal [x-terminal-emulator]         3.12.3-2
ii  gsettings-desktop-schemas                    3.12.2-1
ii  libaccountsservice0                          0.6.37-3
ii  libatk1.0-0                                  2.12.0-1
ii  libaudit1                                    1:2.3.7-1
ii  libc6                                        2.19-7
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                           2.30.7-1
ii  libgdm1                                      3.12.2-2
ii  libglib2.0-0                                 2.40.0-3
ii  libglib2.0-bin                               2.40.0-3
ii  libgtk-3-0                                   3.12.2-1+b1
ii  libpam-modules                               1.1.8-3
ii  libpam-runtime                               1.1.8-3
ii  libpam-systemd                               208-6
ii  libpam0g                                     1.1.8-3
ii  libpango-1.0-0                               1.36.3-1
ii  libpangocairo-1.0-0                          1.36.3-1
ii  librsvg2-common                              2.40.2-1
ii  libselinux1                                  2.3-1
ii  libsystemd-daemon0                           208-6
ii  libsystemd-id128-0                           208-6
ii  libsystemd-journal0                          208-6
ii  libsystemd-login0                            208-6
ii  libwrap0                                     7.6.q-25
ii  libx11-6                                     2:1.6.2-2
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+Debian13
ii  metacity [x-window-manager]                  1:3.12.0-2
ii  policykit-1                                  0.105-6.1
ii  ucf                                          3.0030
ii  x11-common                                   1:7.7+7
ii  x11-xserver-utils                            7.7+3
ii  xterm [x-terminal-emulator]                  308-1

Versions of packages gdm3 recommends:
ii  at-spi2-core               2.12.0-2
pn  desktop-base               <none>
ii  gnome-icon-theme           3.12.0-1
ii  gnome-icon-theme-symbolic  3.12.0-1
ii  x11-xkb-utils              7.7+1
pn  xserver-xephyr             <none>
ii  xserver-xorg               1:7.7+7
ii  zenity                     3.12.1-1.1

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

-- Configuration Files:
/etc/gdm3/Init/Default changed [not included]
/etc/init.d/gdm3 changed [not included]

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