Difference between remove & purge:
- 'remove' uninstall the package, but does not remove the package settings, 
which can disturb the system and conflict with an other driver choice.
- 'purge' remove both package & its settings; that is way recommended.

About /etc/X11/xorg.conf, this is no more used since a couple releases.
so your system should not finf such a path anyway.

Your real problem is not about 'xorg' as you have reported but 'gdm' and/or 
'gnome-session'
******************
May 3 09:20:18 madbox /usr/lib/gdm3/gdm-x-session[2748]: (EE) NVIDIA(GPU-0): 
Failed to acquire modesetting permission.
May 3 09:20:18 madbox /usr/lib/gdm3/gdm-x-session[2748]: (EE) NVIDIA(0): 
Failing initialization of X screen 0
******************

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https://bugs.launchpad.net/bugs/1768906

Title:
  Xorg crash

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