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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?

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3

Same problem here. I was not able to unmount the webdav folder with umount. No error reported, but the resource was not unmounted.

Reporting all mounts shows the webdav resource as fuse type and not davfs, as I was expecting. That triggered the solution.

mount

(...)
https://server/nextcloud/remote.php/dav/files/geonext/ on /home/qgis/nextcloud type fuse (rw,nosuid,nodev,noexec,relatime,user_id=1002,group_id=1002,allow_other,max_read=16384,uid=1002,gid=1002,user=qgis,helper=davfs)

Solution

fusermount -u /home/qgis/nextcloud

The resource was unmounted.

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  • In my case I had to add sudo to the beginning as it was mounted by root: sudo fusermount -u /home/qgis/nextcloud
    – Sina Mansour L.
    Jan 19, 2021 at 6:44

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