Public bug reported:

gnome-session 3.9.90-0ubuntu12

Some packages (e.g. gdm) use a dependency on gnome-session as shorthand
for that plus a window manager.  gnome-session should Recommends: gnome-
shell.  Otherwise xinit starts it, and then it aborts when gnome-shell
isn't present.

e.g. xinit has a Recommends on  xterm | x-session-manager | x-window-manager | 
x-terminal-emulator
so  a session manager is expected to provide everything needed, including a 
window manager.  gdm does similar.

 Looks like we got into this situation after
https://bugs.launchpad.net/ubuntu/+source/gnome-session/+bug/795191
 when a dependency was completely removed, instead of changing to a recommends 
or suggests.  It is apparently possible to have gnome-session start something 
other than gnome-shell, but that's certainly the default behaviour.

  I ran into this after cleaning up all the packages I don't use from my
system, following an upgrade from 12.04 to 14.04.  I use fluxbox, and
just start things from bash in screen in gnome-terminal, not a graphical
shell at all.  I ended up with a graphical login, instead of my usual
text console -> startx

** Affects: gnome-session (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1342970

Title:
  should have a recommends: on gnome-shell

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