It is possibly related to:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1641467 https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1629300 https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1645891
It is possibly related to:
https:/ /bugs.launchpad .net/ubuntu/ +source/ xorg/+bug/ 1641467 /bugs.launchpad .net/ubuntu/ +source/ xorg/+bug/ 1629300 /bugs.launchpad .net/ubuntu/ +source/ xorg/+bug/ 1645891
https:/
https:/