I was used to have 21.04 with the hibernate function recallable via an extension that apparently is not compatible anymore with the new GNOME on 22.04.
Apparently there is not an alternative on the extension site.
Do you know anything that can be used rather than typing in the command in the terminal?
There is an extension that will show your hibernate button. That doesn't necessarily means it will work. So a few steps have to be taken:
Check if hibernate works: Open a terminal and execute systemctl hibernate. IF this does not work, you'll have to look into the Ubuntu handbook on how to define your swap partition/file
Enter terminal as root (sudo will not work). Open (or create) a file with:
nano /var/lib/polkit-1/localauthority/10-vendor.d/com.ubuntu.desktop.pkla
Add the text below at the end of the file:
##NEW entry since Ubuntu 18:
[Re-enable hibernate by default in upower]
Identity=unix-user:*
Action=org.freedesktop.upower.hibernate
ResultActive=yes
##NEW entry since Ubuntu 18:
[Re-enable hibernate by default 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
sudo nano /etc/systemd/system/use-10_grub_common.service
Enter:
[Unit]
Description=Execute the /etc/pm/sleep.d/10_grub_common script after hibernation.
After=hibernate.target
[Service]
Type=oneshot
ExecStart=/etc/pm/sleep.d/10_grub-common thaw
[Install]
WantedBy=hibernate.target
This script will remove an error flag from grub, preventing it showing an error the next time you boot. Since it is a service you need to enable it:
sudo systemctl enable use-10_grub_common
What I did not cover is the definition of your swap (either partition or file) - see the link at point 1.
There are two places where "Resume" has to be defined:
Grub: Resume=UUID=xxxx (when you have a swap partion and xxx is the uid of that) and an entry in /etc/initramfs-tools/conf.d/resume (Resume=UUID=xxxx)
Since I do not know your configuration and have never tried hibernation with swap files I will not elaborate (now)
