Re: The thing about Linux Desktop
@ Chemist, I did go with lightdm in the end. It worked, but I can't say its user friendly. Far as I know, the "default" KDE Plasma 5 log-in manager (sddm) continues to be a buggy pile of not working programming problems.
See here,
https://bbs.archlinux.org/viewtopic.php?id=193286
http://askubuntu.com/questions/776937/sddm-not-starting-after-upgrade-to-16-04-gnome-and-kde-both-installed
Some of the older bugs might be resolved by now (one can always hope).