I just want to mention that the Help button in gnome-disk-utility points to the gnome-user-guide. If MATE provided documentation for that, then maybe it should conditionally point to MATE's documentation when run in MATE. Alternatively, you could ask gnome-disk-utility to ship its own documentation, at least for the benefit of other desktop environments.
The same problem happens if a MATE user installs Nautilus (although MATE uses caja by default as file browser).
I just want to mention that the Help button in gnome-disk-utility points to the gnome-user-guide. If MATE provided documentation for that, then maybe it should conditionally point to MATE's documentation when run in MATE. Alternatively, you could ask gnome-disk-utility to ship its own documentation, at least for the benefit of other desktop environments.
The same problem happens if a MATE user installs Nautilus (although MATE uses caja by default as file browser).
$ apt show gnome-user-guide
Version: 3.20.2-1
Installed-Size: 47.3 MB
Download-Size: 2,361 kB
$ apt show ubuntu-docs
Version: 16.04.3
Installed-Size: 67.4 MB
Download-Size: 1,152 kB
Anyway, I'm not blocking this but just wanted you to be aware of this.