Enable Ubuntu 18.04/22.04/24.04 hibernate

To make things easy: create a swap drive instead of using a swap file.

In the BIOS settings: disable secure boot FIRST.

For 24.04:

Follow: https://ubuntuhandbook.org/index.php/2021/08/enable-hibernate-ubuntu-21-10/

• First, run command to create a config file:

  sudo nano /etc/polkit-1/rules.d/10-enable-hibernate.rules

• When file opens, paste the lines below and press Ctrl+S to save, finally press Ctrl+X to exit.

  polkit.addRule(function(action, subject) {
      if (action.id == "org.freedesktop.login1.hibernate" ||
          action.id == "org.freedesktop.login1.hibernate-multiple-sessions" ||
          action.id == "org.freedesktop.upower.hibernate" ||
          action.id == "org.freedesktop.login1.handle-hibernate-key" ||
          action.id == "org.freedesktop.login1.hibernate-ignore-inhibit")
      {
          return polkit.Result.YES;
      }
  });

For 22.04

Then follow: https://www.geeksforgeeks.org/how-to-enable-hibernate-in-ubuntu-22-04-lts/

Edit the file /etc/systemd/sleep.conf with the following configuration:

[Sleep]
HibernateMode=shutdown

Enable the hibernation menu:

sudo gedit /etc/polkit-1/localauthority/50-local.d/com.ubuntu.desktop.pkla

[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