Thanks for the bug report. 1. If you have any gnome-shell extensions (other than the default Ubuntu ones) then please uninstall them and retest. We find a large number of bugs are caused by Gnome extensions.
2. Your kernel log mentions a few errors from the nouveau kernel driver: [ 274.310794] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 619444 [ IBUS ] [ 274.959650] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 619444 [ IBUS ] [ 294.627149] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 619444 [ IBUS ] [ 305.108717] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 619444 [ IBUS ] but we can't know for sure if those are related to what you see. Please try installing the proprietary Nvidia driver instead, as it usually provides better stability: sudo apt install nvidia-driver-418 I am confident one of those two suggestions will solve the problem. Please tell us which (if any) works. ** Summary changed: - Xorg freeze + [nouveau] Xorg freeze ** Tags added: nouveau ** Package changed: xorg (Ubuntu) => ubuntu ** Changed in: ubuntu Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1829430 Title: [nouveau] Xorg freeze To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1829430/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs