I recently installed 18.04.2 on fresh new hardware, and--give or take the usual pains--everything seems to be fine and pleasing. But...I went to check the contents of an old thumb drive using "Disks", which invokes mate-disks, but "Disks"t had disappeared from the menu (though it is properly there and checked for display, and the Menuer app Properties box even shows the correct icon).
Trying mate-disks from the command line, I just get "mate-disks: command not found". I am pretty sure I used Disks sometime after the install, so I just don't know what happened. More germane, I have no idea where or how to get it back: Synaptic (refreshed) does not show it, and a Google seems to give me nothing.
Any help, please?