Here's the full journalctl log for livecd debugging session I reported above.
It appears that nautilus was totally hanging because I failed to ever open any file manager windows even after waiting for a long time. Firefox did eventually start and started to work until I tried to open file picker to attach a file to this bug - after that Firefox never recovered either. ** Attachment added: "sudo journalctl --since "2 days ago" after trying to investigate the issue and switching virtual terminals many times" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1950088/+attachment/5538674/+files/2021-11-07-journalctl.full.log -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-nouveau in Ubuntu. https://bugs.launchpad.net/bugs/1950088 Title: jammy: noveau driver hangs for minutes when Firefox is started (live cd/usb, MacBookPro6,2) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1950088/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp