I actually found a double "Extras" catalogue. Don't know how that got there, I guess it's possible that I have been ignorant of an incomplete catalogue being loaded and as a result a messed up Application Manager.

-Midnight Commander install - OK.

Much thanks, I do not have to give any commands as root as yet! But I want to eventually sync with Thunderbird. Before I do that I want to have a reasonable amount of control, so a file manager is wished for. First I go reading on, ofcourse - thumbs up! -