KDE broken after power outage

Theres quite a few errors there.

But before all the failure and coredumps there is

Which strikes me as odd.

But so does this whole situation … even a power loss would rarely create big problems for the system. Were you in the middle of updating?

If so then you might want to reference this post

If your disk was in really bad shape then it wouldnt boot at all. But I would maybe suggest running fsck from a live environment on your drive anyways, just to be sure.

( you cannot run fsck on a mounted device/partition so it must be from another system or ISO )