I have filled a bug  with a strange problem after GNOME 3.22 update. If I mount an USB stick that it is not in /etc/fstab, then I cannot unmount it as a user using nautilus (or nemo). However, I saw one person (zaitor) that is not having this problem. Hence, I am wondering if anyone else can test this to see if it is a local problem.
Steps to reproduce ==================
1. Add an USB stick that is not listed in /etc/fstab 2. Try to unmount it using nautilus (Files). 3. Here, I see a message "Operation not permitted".
----------  https://bugzilla.opensuse.org/show_bug.cgi?id=1001554
Best regards, Ronan Arraes