I am very good with all Debian and Ubuntu Linux Distributions (Chrome OS, self-developed and managed OSes Debian 8, Debian 9, Debian 10, Debian Bullseye, Ubuntu 18.04-3 LTS, Ubuntu 19.04, Ubuntu 20.04, Cinnamon Desktop (Debian and Ubuntu WM), KDE WM, XFCE WM, KUbuntu, XUbuntu, GNOME, etc.)