Gnome Shell extension that adds a hibernate/hybrid suspend button in Status menu.
Originally developed by @arelange; now maintained by @davidbailey00.
Usually this means hibernation is disabled on your system. Please see:
https://askubuntu.com/questions/1034185/ubuntu-18-04-cant-resume-after-hibernate/1064114#1064114
or
https://help.ubuntu.com/16.04/ubuntu-help/power-hibernate.html