If it's any bit of helpful information, I occasionally have this issue (on 18.04) and it is fixed by a proper shutdown and boot. It seems to happen for me when one of the servers that I sshfs to crashes/becomes unavailable (or something else server side) and the issue persists past the time in which the server is back and functional.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1702368 Title: Mounted sshfs filesystems sometimes prevent suspend To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/1702368/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs