Ubuntu suspend problem

 When using Ubuntu 18.04, there's always buggy blank screen / suspend action that force me to reboot my PC

The easiest one is blank the screen, than unplug your second screen, boom your PC die..

so I just change to xscreensaver

$ sudo apt-get install xscreensaver xscreensaver-gl-extra xscreensaver-data-extra

then remove buggy gnome -screensaver

$ sudo apt-get remove gnome-screensaver

then search for startup and add an entry