On: Replace GRUB2 with systemd-boot on Ubuntu 18.04 (2...

[JdeBP]

Little-known things that are actually on the TODO list for systemd include:

* UUIDs instead of process IDs

* a "systemctl top"

* closer integration with GNOME Terminal, in particular its PTY helper

* several PAM tweaks that, taken together, I suspect will eventually lead to a PAM replacement