I recently upgraded my primary computer from Ubuntu 16.04.5 LTS to 18.04.1 LTS (hardware summary below). I have the machine set up for dual-booting with Ubuntu and Debian 9.5 from separate hard drives, each with its own Grub installation. My preferred window manager is Gnome Flashback although I had been using Unity for a while toward the end of 16.04.
As I have done in the past, I installed the 18.04 upgrade using the Update Manager (UM). The upgrade process went smoothly in terms...
