Folks: Why don’t you use Debian.
Also folks: Why not xfce?
Me: Trying Debian out for the first time in a VM with xfce… *enters password*… *presses tab*… Oh! Oh…
(There are few absolutes in design but I’m going to go out on a limb here and say that this is the absolute worst way you can design a simple sign-in form that has two text fields.)