oh good, today’s attempt to create an archlinux distrobox succeeded [now a later kdelinux build than my earlier attempt], & so i was able to install kbackup in it then export it to my plasma apps menu… so now by hook or by crook, i have it – ha!
well that was disappointing. the latest build 202605280254 is broken; after entering my LUKS password, it then dumps me to the rescue screen. i had to boot back into my build of a few days ago [the 24th, iirc]. consequently, now retrying the Discover process per preceding post, only produced the same failure.
happy to have my distrobox working again.