Thanks Steve. To be completely sure it's this bug we would need to see the log message from the assertion failure (run journalctl), but it looks likely to be this one.
When you say you removed "gstreamer", which packages do you mean? -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1861609 Title: [focal] Xorg crashed with assertion failure (usually in a VM) at [privates.h:121: dixGetPrivateAddr: Assertion `key->initialized' failed] and call stack comes from DRIMoveBuffersHelper Status in xorg-server package in Ubuntu: Confirmed Bug description: Xorg crashed with assertion failure (usually in a VM): privates.h:121: dixGetPrivateAddr: Assertion `key->initialized' failed. and call stack comes from DRIMoveBuffersHelper WORKAROUND Select 'Ubuntu on Wayland' on the login screen. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1861609/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

