Comment #6 only demonstrates a nouveau bug. That is bug 1553328, or https://bugs.freedesktop.org/show_bug.cgi?id=92438 whereby nouveau is not thread safe. It's a very old issue so if you experience that my best advice is to just avoid nouveau.
But that wasn't from the original reporter... hugh, please run this command in a terminal: yelp help:gnome-help and tell us what you see in the terminal text window. hugh: Please also run this command: lspci -k > lspcik.txt and send us the resulting file 'lspcik.txt'. ** Package changed: gnome-getting-started-docs (Ubuntu) => webkit2gtk (Ubuntu) ** Bug watch added: freedesktop.org Bugzilla #92438 https://bugs.freedesktop.org/show_bug.cgi?id=92438 ** Changed in: webkit2gtk (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1804786 Title: Garbage occurred when Playing the video in the Ubuntu Desktop Guide To manage notifications about this bug go to: https://bugs.launchpad.net/yelp/+bug/1804786/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs