If I had to guess then I would guess the most likely cause is the changes I made in the latest update:
https://launchpad.net/ubuntu/+source/mutter/3.28.4-0ubuntu18.04.1
If I had to guess then I would guess the most likely cause is the changes I made in the latest update:
https:/ /launchpad. net/ubuntu/ +source/ mutter/ 3.28.4- 0ubuntu18. 04.1