[Bug 1754084] [NEW] Freecad crashes at start

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Zachary Gummow (maleous):

[Impact]

 * FreeCAD crashes at startup in Ubuntu 18.04.

 * Backporting the proposed fix will prevent FreeCAD from crashing.

 * The proposed upload will fix the issue by providing an environment
variable in the freecad.desktop file. This environment variable will set
LIBGL_DRI3_DISABLE=true.

[Test Case]

 * On Ubuntu 18.04 with a system where a video card or some form of graphics acceleration is used, install freecad and run normally.
 
 This is printed at the console:

FreeCAD 0.16, Libs: 0.16R
© Juergen Riegel, Werner Mayer, Yorik van Havre 2001-2015
  #####                 ####  ###   ####
  #                    #      # #   #   #
  #     ##  #### ####  #     #   #  #   #
  ####  # # #  # #  #  #     #####  #   #
  #     #   #### ####  #    #     # #   #
  #     #   #    #     #    #     # #   #  ##  ##  ##
  #     #   #### ####   ### #     # ####   ##  ##  ##

failed to create drawable
[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
freecad: ../../src/xcb_io.c:259: poll_for_event: Zusicherung »!xcb_xlib_threads_sequence_lost« nicht erfüllt.
Abgebrochen

[Regression Potential]

 * An environment variable disabling LIBGL_DIR3 is set in the
freecad.desktop file. The affected functionality is limited to the
FreeCAD process and any child processes.

** Affects: freecad (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: freecad (Debian)
     Importance: Unknown
         Status: New


** Tags: bionic cosmic
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Freecad crashes at start
https://bugs.launchpad.net/bugs/1754084
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