Gnome Shell extension that adds a hibernate/hybrid suspend button in Status menu.
Originally developed by @arelange; now maintained by @p91paul.
Supports GNOME 3.36.
Try launching from your terminal
systemctl hibernate
If it doesn't work, it 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
If you are running Ubuntu, try putting
[Enable hibernate in upower]
Identity=unix-user:*
Action=org.freedesktop.upower.hibernate
ResultActive=yes
[Enable hibernate in logind]
Identity=unix-user:*
Action=org.freedesktop.login1.hibernate;org.freedesktop.login1.handle-hibernate-key;org.freedesktop.login1;org.freedesktop.login1.hibernate-multiple-sessions;org.freedesktop.login1.hibernate-ignore-inhibit
ResultActive=yes
into /etc/polkit-1/localauthority/10-vendor.d/com.ubuntu.desktop.pkla
Otherwise check for similar settings for your distribution. Credit: arelange#41 (comment)