I've also encountered the same trouble with some of my external thumbnailers (lo-thumbnailer, msoffice-thumbnailer, ...).
I realised that bwarp calls fail under Ubuntu and Debian because of --symlink options used on /bin and /sbin. --ro-bind should be used instead of --symlink. Till problem is solved on the Nautilus side, I've written a small article to explain how to get back external thumbnailers under 18.04 and 18.10 with the help of a bwrap wrapper under /usr/local/bin. http://bernaerts.dyndns.org/linux/360-ubuntu-nautilus-external- thumbnailer-failure Hope it helps -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795668 Title: Enable bubblewrap in gnome-desktop3 for Ubuntu 18.04 LTS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bubblewrap/+bug/1795668/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
