removing stuff that's not trinity

a week or so ago i upgraded to ubuntu 18.04 from 16.04. i do not think the protonmail bridge problems have anything to do with this, but in any event it brought a lot of plasma, etc., stuff that i do not want. i see that i have an application -- looks like kcontrol, superficially -- to configure sddm. i am using tdm. is there a decent recipe for the removal of kde/plasma stuff? i suppose it's worthwhile to keep gnome (or something) around in case for some reason i can't get into tde, and of course there are gnome/gtk apps i use under tde. but it seems as if the upgrade brought me a load of stuff that i don't want, and i'm not sure that it plays nicely. i can do a search on "trinity" of course, to find tde packages, but i don't know of any search term that limits the results to non-trinity kde applications and libraries. dep Sent with ProtonMail. Because privacy matters.