Great, there is a known issue that if thumbnailing fails for some reason then it will never be retried again. Next time you get the problem feel free to comment with the 'journalctl -b 0' log from the session included
** Changed in: nautilus (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1905100 Title: Cover art not shown for file which has a cover art To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/1905100/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs