Public bug reported:

In /etc/X11/Xsession.d/70gconfd_path-on-session these lines fail if
there is a space in ${DESKTOP_SESSION}:

  export MANDATORY_PATH=${GCONF_PREFIX}/${DESKTOP_SESSION}.mandatory.path
  export DEFAULTS_PATH=${GCONF_PREFIX}/${DESKTOP_SESSION}.default.path

The error output to ~/.xsession-errors is:

/etc/X11/Xsession: 6: export: Session.mandatory.path: bad variable name

I'm not sure why the error is pointing to the wrong file. Adding quotes around 
the variables in those lines makes the error go away. This error totally 
prevents logging into X. It happens when using LXDM to start Xfce, because LXDM 
sets DESKTOP_SESSION to Name from /usr/share/xsessions/xfce.desktop :
Name=Xfce Session

These LXDM bugs relate to the problem, but I guess the lack of quoting
here is the root cause. I'm not sure if setting DESKTOP_SESSION to the
Name from the .desktop file and having a space in it is wise, but
everything seems to work after fixing the quoting. Proper quoting is
used elsewhere.

https://sourceforge.net/p/lxde/bugs/420/

https://bugs.launchpad.net/ubuntu/+source/lxdm/+bug/875991

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gconf2-common 3.2.6-3ubuntu6
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: XFCE
Date: Thu Jun  2 10:16:46 2016
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_CA:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: gconf
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gconf (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1588395

Title:
  70gconfd_path-on-session doesn't quote DESKTOP_SESSION and fails if it
  contains a space

Status in gconf package in Ubuntu:
  New

Bug description:
  In /etc/X11/Xsession.d/70gconfd_path-on-session these lines fail if
  there is a space in ${DESKTOP_SESSION}:

    export MANDATORY_PATH=${GCONF_PREFIX}/${DESKTOP_SESSION}.mandatory.path
    export DEFAULTS_PATH=${GCONF_PREFIX}/${DESKTOP_SESSION}.default.path

  The error output to ~/.xsession-errors is:

  /etc/X11/Xsession: 6: export: Session.mandatory.path: bad variable
  name

  I'm not sure why the error is pointing to the wrong file. Adding quotes 
around the variables in those lines makes the error go away. This error totally 
prevents logging into X. It happens when using LXDM to start Xfce, because LXDM 
sets DESKTOP_SESSION to Name from /usr/share/xsessions/xfce.desktop :
  Name=Xfce Session

  These LXDM bugs relate to the problem, but I guess the lack of quoting
  here is the root cause. I'm not sure if setting DESKTOP_SESSION to the
  Name from the .desktop file and having a space in it is wise, but
  everything seems to work after fixing the quoting. Proper quoting is
  used elsewhere.

  https://sourceforge.net/p/lxde/bugs/420/

  https://bugs.launchpad.net/ubuntu/+source/lxdm/+bug/875991

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: gconf2-common 3.2.6-3ubuntu6
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Thu Jun  2 10:16:46 2016
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_CA:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SourcePackage: gconf
  UpgradeStatus: No upgrade log present (probably fresh install)

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