So it seems that the problem is not that xorg doesn't set
DESKTOP_SESSION correctly, it's that SDDM uses an absolute path for this
instead of just the base name like every other window manager.

I'll fix it in Ubuntu; meanwhile, a bug is filed upstream. Linked here.

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

** Changed in: xorg (Ubuntu Bionic)
       Status: Confirmed => Invalid

** Changed in: xorg (Ubuntu Bionic)
   Importance: High => Wishlist

** Changed in: xorg (Ubuntu Bionic)
     Assignee: Simon Quigley (tsimonq2) => (unassigned)

** Changed in: sddm (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: sddm (Ubuntu Bionic)
   Importance: Undecided => High

** Changed in: sddm (Ubuntu Bionic)
     Assignee: (unassigned) => Simon Quigley (tsimonq2)

** Also affects: sddm via
   https://github.com/sddm/sddm/issues/852
   Importance: Unknown
       Status: Unknown

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Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1668722

Title:
  60x11-common_xdg_path uses $DESKTOP_SESSION which needs a sanity check

Status in SDDM:
  Unknown
Status in sddm package in Ubuntu:
  In Progress
Status in xorg package in Ubuntu:
  Invalid
Status in sddm source package in Bionic:
  In Progress
Status in xorg source package in Bionic:
  Invalid

Bug description:
  This file:
  /etc/X11/Xsession.d/60x11-common_xdg_path
  contains references to $DESKTOP_SESSION variable.

  On one of my Ubuntu installs this variable contains: "plasma",
  on the other it contains: "/usr/share/xsessions/plasma".

  I don't know where either example comes from, but the upshot is that
  paths are added to XDG_DATA_DIRS and XDG_CONFIG_DIRS that don't exist.
  MANDATORY_PATH is also affected I believe, maybe others.

  Surely a sanity check of the generated paths is in order. Seems
  pointless to add non-existent ones.

  $XDG_SESSION_DESKTOP looks like a replacement for $DESKTOP_SESSION,
  but is that true?

  Cheers!

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