How can I dismount or debug why this mount can't be unmounted? background:
- Kubuntu 20.04
- lsof $mountpoint => empty list
- all terminal windows are closed
- all other apps are closed.
- a webdav davfs $url is mounted on $mountpoint via:
sudo mount -t davfs https://server/path $mp
When I try to unmount, nothing happens, and no errors are displayed:
~$ sudo umount $mountpoint ~$
But $mountpoint is still mounted, No errors were given.
How can I unnmount it without a full restart?
How can I debug this situation?