It appears this message keeps happening with the gnome-shell crash:

  "Impossible to lock surface front buffer: Function not implemented"

that's from mutter's "native" (Wayland) backend:

  next_bo = gbm_surface_lock_front_buffer (gbm_surface);

  if (!next_bo)
    {
      g_error ("Impossible to lock surface front buffer: %m");
      return FALSE;
    }

so it means your kernel graphics driver (mgag200) does not fully support
Wayland sessions.

Please just use Xorg sessions instead (log into "Ubuntu" instead of
"Ubuntu on Wayland").

** Summary changed:

- gnome-shell trap int3 no desktop
+ gnome-shell trap int3 no desktop (MGA G200eW fails when calling 
gbm_surface_lock_front_buffer)

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https://bugs.launchpad.net/bugs/1826025

Title:
  gnome-shell trap int3 no desktop ("Impossible to lock surface front
  buffer: Function not implemented" on Matrox graphics card)

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