Felix Miata composed on 2020-01-23 01:58 (UTC-0500):
Anyone else have a perfectly working 16.04, upgrade to 18.04, then X segfaults? Neither TDE nor IceWM run because X doesn't get far enough along. Google hasn't found me anything on point as yet. :-(
http://fm.no-ip.com/Tmp/Linux/Xorg/xorg.0.log-u1804-p5bse-backtrace
Un-disabling compositing in xorg.conf fixed this.