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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