Commenting on this old post I found via search because Uli.Heller's suggestion worked for me to remove the snap core18 from Ubuntu 19.04. The core18 snap was mounted thusly:
/dev/loop13 55808 55808 0 100% /snap/core18/1066 First I disabled it: snap disable core18 Then I unmounted it: umount /dev/loop13 and then I could remove the snap: snap remove core18 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1589210 Title: snap remove "core" on classic not allowed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1589210/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs