Comment 35 for bug 1069964

Hi Tim, I assume that Nautilus (or Caja in the case of Ubuntu Mate) is actually responsible for the "media already mounted" warning because if you open dconf-editor and go to "org/gnome/desktop/media-handling" (or "org/mate/desktop/media-handling") and change both "automount" and "automount-open" to false then the "media already mounted" warning goes away. The downside is that doing so interferes with mounting usb drives, cameras, etc so it's not a truly viable workaround.

The descriptions in dconf certainly mention Nautilus and Caja specifically:

If set to true, then Nautilus will automatically mount media such as user-visible hard disks and removable media on start-up and media insertion.

If set to true, then Nautilus will automatically open a folder when media is automounted. This only applies to media where no known x-content/* type was detected; for media where a known x-content type is detected, the user configurable action will be taken instead.

If set to true, then Caja will automatically mount media such as user-visible hard disks and removable media on start-up and media insertion.

If set to true, then Caja will automatically open a folder when media is automounted. This only applies to media where no known x-content/* type was detected; for media where a known x-content type is detected, the user configurable action will be taken instead.

So I really assume that some file managers (Nautilus, Caja, and possibly Nemo) attempt to mount the blank media after gvfs has already mounted it and therefore produce that warning. I'll grant you that it's only a cosmetic issue but it's certainly one of those bugs that just shouts "not ready for prime time" and sends users looking elsewhere for a reliable distro.

I'd think there'd be a way to have Nautilus and Caja just see if media is already mounted by gvfs and if so say nothing rather than displaying a useless and meaningless warning.

Since this does also effect the Mate DE I took the liberty of subscribing Martin Wimpress, so apologies in advance to Martin. My intention is not to be pushy but only to inform.