This bug was fixed in the package xorg-server - 2:1.20.1-3ubuntu2
--------------- xorg-server (2:1.20.1-3ubuntu2) cosmic; urgency=medium
* dont-init-glamor-on-llvmpipe.diff: Glamor shouldn't be used on llvmpipe, as it might end up crashing the server on a racy bootup. (LP: #1792932)
-- Timo Aaltonen <email address hidden> Tue, 02 Oct 2018 21:40:03 +0300
This bug was fixed in the package xorg-server - 2:1.20.1-3ubuntu2
---------------
xorg-server (2:1.20.1-3ubuntu2) cosmic; urgency=medium
* dont-init- glamor- on-llvmpipe. diff: Glamor shouldn't be used on
llvmpipe, as it might end up crashing the server on a racy bootup.
(LP: #1792932)
-- Timo Aaltonen <email address hidden> Tue, 02 Oct 2018 21:40:03 +0300