I mean if you actually want to overwrite the main SSD this is okay. Calamares is very nice too.
Kubuntu stays on Plasma 5 forever so I highly recommend against it. There are many bugs that will not get fixed, the fixes are only in Plasma 6.
I recommend Fedora Kinoite. Use Flatpaks, layer the packages you dont need. Add rpmfusion and layer libavcodec-freeworld to get video playback working.
I broke all KDE distros, Kubuntu included. I wouldnt use anything other than Fedora Kinoite, nor want to maintain that mess. Have a look at my latest post for some explanations.