*** This bug is a duplicate of bug 972324 ***
    https://bugs.launchpad.net/bugs/972324

Thank you for taking the time to report this bug and helping to make
Ubuntu better. This particular bug has already been reported and is a
duplicate of bug 972324, so it is being marked as such. Please look at
the other bug report to see if there is any missing information that you
can provide, or to see if there is a workaround for the bug.
Additionally, any further discussion regarding the bug should occur in
the other report. Feel free to continue to report any other bugs you may
find.


** This bug has been marked a duplicate of bug 972324
   server fails to start up if TMPDIR is set to something on a different 
filesystem from /var/lib/xkb

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https://bugs.launchpad.net/bugs/1564920

Title:
  x.org server fails to start when $TMPDIR is set

Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  When the Xmir server is run on a device or desktop under Unity 8 it
  fails to start with the following error messages.

    [xkb] Can't rename /run/user/32011/confined/com.ubuntu.sdk/fileSgDXpU to 
/tmp/server-B20D7FC79C7F597315E3E501AEF10E0D866E8E92.xkm, error: Invalid 
cross-device link
    XKB: Failed to compile keymap
    Keyboard initialization failed. This could be a missing or incorrect setup 
of xkeyboard-config.
    (EE) Fatal server error:
    (EE) Failed to activate core devices.(EE) 

  We traced the problem down to the fact that the $TMPDIR is set in the
  environment and points to a confined location in the /run filesystem,
  and x.org uses the hardcoded path of /tmp which is a different
  filesystem.  A Ubuntu-specific patch to the x.org server attempts to
  rename the .xkm file across filesystems (which is not allowed).

  To avoid this error the Ubuntu-speicific patch to cache the xkb file
  should also patch the hardcoded /tmp to use $TMPDUR if it is set.

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