Linux: Fixing Suspend in Xubuntu

Annoyance: Xubuntu fails to suspend.

Details: Xubuntu uses a new program called light-locker to lock the screen. For some reason, possibly hardware-related, light-locker prevents the system from going into power-save mode.

Fix (possibly?): Replace light-locker with xscreensaver.

sudo apt remove light-locker
sudo apt install xscreensaver