Public bug reported:

Just as the title says, installing 'gnome-session-flashback' in Ubuntu
GNOME provides a GNOME Flashback (Compiz) session even though 'compiz'
is not installed:

lance@lance-desktop:~$ ls /usr/share/xsessions
gnome-classic.desktop  gnome-fallback-compiz.desktop
gnome.desktop          gnome-fallback.desktop
lance@lance-desktop:~$ apt-cache policy compiz
compiz:
  Installed: (none)
  Candidate: 1:0.9.11+14.04.20140423-0ubuntu1
  Version table:
     1:0.9.11+14.04.20140423-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main i386 
Packages
     1:0.9.11+14.04.20140409-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main i386 Packages

This is much more than a minor inconvenience since Ubuntu GNOME has no
keyboard shortcut set for killing X out-of-box so, if the user selected
auto-login during installation, with no window manager running it can be
quite difficult to get back to the login screen to select a different
session.

The easiest way I found so far is to open a TTY via Ctrl+Alt+F1 and then
run "sudo nano /etc/gdm/custom.conf", change "AutomaticLoginEnable=true"
to "AutomaticLoginEnable=False", then run "sudo dpkg-reconfigure gdm",
followed by "sudo reboot". Then on reboot a working session can be
selected.

I would hope that there is some way to NOT display a session if it's
window manager is not installed.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gnome-session-flashback 1:3.8.0-1ubuntu12
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
Uname: Linux 3.13.0-29-generic i686
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: i386
CurrentDesktop: Unity
Date: Thu Jun 19 11:27:41 2014
GsettingsChanges:
 
InstallationDate: Installed on 2014-05-30 (20 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Release i386 
(20140416.2)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-panel
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: apport-bug i386 trusty

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https://bugs.launchpad.net/bugs/1332183

Title:
  Installing gnome-session-flashback in Ubuntu GNOME Trusty provides a
  Flashback (Compiz) session when compiz is not installed

Status in “gnome-panel” package in Ubuntu:
  New

Bug description:
  Just as the title says, installing 'gnome-session-flashback' in Ubuntu
  GNOME provides a GNOME Flashback (Compiz) session even though 'compiz'
  is not installed:

  lance@lance-desktop:~$ ls /usr/share/xsessions
  gnome-classic.desktop  gnome-fallback-compiz.desktop
  gnome.desktop          gnome-fallback.desktop
  lance@lance-desktop:~$ apt-cache policy compiz
  compiz:
    Installed: (none)
    Candidate: 1:0.9.11+14.04.20140423-0ubuntu1
    Version table:
       1:0.9.11+14.04.20140423-0ubuntu1 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main i386 
Packages
       1:0.9.11+14.04.20140409-0ubuntu1 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main i386 Packages

  This is much more than a minor inconvenience since Ubuntu GNOME has no
  keyboard shortcut set for killing X out-of-box so, if the user
  selected auto-login during installation, with no window manager
  running it can be quite difficult to get back to the login screen to
  select a different session.

  The easiest way I found so far is to open a TTY via Ctrl+Alt+F1 and
  then run "sudo nano /etc/gdm/custom.conf", change
  "AutomaticLoginEnable=true" to "AutomaticLoginEnable=False", then run
  "sudo dpkg-reconfigure gdm", followed by "sudo reboot". Then on reboot
  a working session can be selected.

  I would hope that there is some way to NOT display a session if it's
  window manager is not installed.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: gnome-session-flashback 1:3.8.0-1ubuntu12
  ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
  Uname: Linux 3.13.0-29-generic i686
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: i386
  CurrentDesktop: Unity
  Date: Thu Jun 19 11:27:41 2014
  GsettingsChanges:
   
  InstallationDate: Installed on 2014-05-30 (20 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Release i386 
(20140416.2)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-panel
  UpgradeStatus: No upgrade log present (probably fresh install)

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