Language reverts to local language I've not installed

[SquadPatrick95]

Hi, sorry if I'm not providing enough details, as I'm new to how to document about GNU/Linux.

I've installed Ubuntu (22.04) on a stationary computer, and wasn't really happy with it, so found out I could install Kubuntu on top (or the KDE/Kubuntu package that effectively makes Ubuntu into Kubuntu).

The login screen for Kubuntu has always somehow been in Norwegian. I am Norwegian, but Ubuntu/Kubuntu was installed in English. (Never have I set a setting for Norwegian, except for the keyboard input.)

After going to SDDM settings, and skipping the login screen (I'm the only user), the entire desktop session is in Norwegian. I seemingly cannot change the language from Norwegian to English as Norwegian was never installed in the first place, and English is the only option.
See image here: https://i.imgur.com/qvqAnwr.png

(Not only is it in Norwegian, it's 'New Norwegian', an even stranger language, only maintained by extremists)

[claydoh]

so found out I could install Kubuntu on top (or the KDE/Kubuntu package that effectively makes Ubuntu into Kubuntu).

No,it doesn't. they are the exact same OS.

You have both a full Ubuntu Gnome and a full Kubuntu Plasma installed, plus their ancillary tools and utils, some of which may conflict with each other, possibly maybe.

Depending on what specific method/meta-package you used, this is well known to potentially cause weird issues sometime, even if this is strongly anecdotal.