In Kubuntu (22.04) Ubiquity window is still wider than 800x600: 916x589 - welcome screen 916x560 - installer run from "Try It"
In the "Try It" option there is also a Plasma panel visible at the bottom (44px), which limits the available desktop space even further to 800x556.
Ubiquity window being too big makes installation troublesome in e.g. VirtualBox.
In Kubuntu (22.04) Ubiquity window is still wider than 800x600:
916x589 - welcome screen
916x560 - installer run from "Try It"
In the "Try It" option there is also a Plasma panel visible at the bottom (44px),
which limits the available desktop space even further to 800x556.
Ubiquity window being too big makes installation troublesome in e.g. VirtualBox.