this is an old thread but in gnome bug reports it is a recent open issue so it may be of some use to anyone searching for hours for a solution to fix gvfs-fuser issues - which all seem to be tightly related.


Error Msg from meld:

    Error copying '/media/root/5FDA03906F33F217/SAVE/rsyncTEST-usb/allusers' to '/run/user/0/gvfs/ftp:host=192.168.0.103/var/ftp/ftpd/images/PersistenceUSBs/rsync-meld/allusers'

    [Errno 95] Operation not supported: '/run/user/0/gvfs/ftp:host=192.168.0.103/var/ftp/ftpd/images/PersistenceUSBs/rsync-meld/allusers'.

I encountered the gvfs-fuser issue attempting to use meld/diff/kdiff over ftp.  Seems the problem is between fuser and gvfs.  The problem seems not to occur in 3.15.1 but begins being reported in 3.15.2.(the new python ver?)
Solution is a workaround not a fix - files/directories will copy but error is still displayed.

[Christopher's answer][1] defines the problem and provides the solution.

Another possible solution is using sshfs (see [this comment][2] and [this thread][3]). For more information on `gvfs-commands`, see [What is the difference between gvfs commands and common commands like cat, ls, cp?][4]

Possibly-related bugs include [GNOME #317875][5] and [GNOME #768281][6].

  [1]: https://unix.stackexchange.com/a/77457
  [2]: https://bugzilla.gnome.org/show_bug.cgi?id=317875#c4
  [3]: https://peppermintos.net/viewtopic.php?f=35&t=5344
  [4]: https://askubuntu.com/q/499523
  [5]: https://bugzilla.gnome.org/show_bug.cgi?id=317875
  [6]: https://bugzilla.gnome.org/show_bug.cgi?id=768281
  [7]: https://pastebin.com/WnRnWz3G