yay, unity8 is installable again on 18.04
https://github.com/ubports/unity8-desktop-install-tools
after installing use the workarround from this thread or follow the opened issue at https://github.com/ubports/unity8-desktop-install-tools/issues/22
xwayland doesn't work but @mariogrip and the mir people are making progress on it, i think. gtk3 apps sort of work, qt are rendered quite small for my eyes
screencast unity8 on ubuntu 18.04
https://www.youtube.com/watch?v=PITcJLo0A58
it's recorded with a phone because mirscreencasting didn't work for me
mirscreencast --stdout -m /run/mir_socket -s 1920 1080 --cap-interval 2 | ffmpeg -f rawvideo -pix_fmt bgra -s 1920x1080 -r 30 -i - -c:v libx264 -preset ultrafast -f matroska cast_full.mkv