Update to Kubuntu 24.04 went great!
 

My experience. Two days ago, I upgraded KUbuntu from 23.10 to 24.04 LTS on my R&D box. It just worked. After a couple of days of using it, nothing found that was a problem or non-functional. As usual, upgrades now are just ho-hum, works the same as previous version. Eventually I'll probably run into something under the hood that is different, but the computer drives the same, looks the same ... I like it that way, actually -- no surprises!

I'll leave my other laptops/desktops/server running KUbuntu 22.04 LTS in the meantime. Let the dust settle on 24.04.

As a quick follow up, still no fallout from the upgrade. Usually by now I'd have something that needs sorting out, but not this time.

Ran into my first program that wouldn't run.

Balena Etcher application (for flashing .img on SSDs) would not start due to a sandbox issue. Found the solution:

./balenaEtcher-1.7.9-x64.AppImage --no-sandbox --disable-gpu-sandbox

Which works, so off and running.