[Bug 981049] Re: LTSP needs a non-intrusive method to set a default session

[Alkis Georgopoulos]

I think the problem is that Unity doesn't have
  Provides: x-session-manager
and thus it breaks the update-alternatives system concept.

$ apt-cache show gnome-session | grep Provides
Provides: gnome3-session, x-session-manager

$ sudo update-alternatives --config x-session-manager
There are 2 choices for the alternative x-session-manager (providing /usr/bin/x-session-manager).

  Selection    Path                      Προτε Status
------------------------------------------------------------
* 0            /usr/bin/gnome-session     50        auto mode
  1            /usr/bin/gnome-session     50        manual mode
  2            /usr/bin/openbox-session   40        manual mode


No Unity session there. No, gnome-session isn't enough, since Ubuntu provides a completely different shell than upstream Gnome, it should list it as a separate session.

** Also affects: unity (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/981049

Title:
  LTSP needs a non-intrusive method to set a default session

Status in “ltsp” package in Ubuntu:
  Confirmed
Status in “unity” package in Ubuntu:
  New

Bug description:
  Currently, the default lts.conf file in Edubuntu looks like this:

  """
  # see http://edubuntu.org/documentation for more information

  [default]
    LDM_THEME=edubuntu
    LANG=en_US.UTF-8
    LANGUAGE=en_CA.UTF-8
    LDM_LANGUAGE=en_CA.UTF-8
    LDM_SESSION="gnome-session --session=gnome-fallback"
  """

  LDM_SESSION sets the session to gnome-fallback, which is ok for a
  default, however, if Unity 2D is installed and a user selects it, the
  user will get Gnome Fallback again for subsequent logins.

  LTSP needs a lts.conf tag like LDM_DEFAULT_SESSION, where a default
  session can be specified, but when a user has something else specified
  in .dmrc it would be used instead. This does not currently exist in
  LTSP/LDM.

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