Enable hibernate on Ubuntu 20.04

Source : How to Change Lid Close Behavior in Ubuntu 20.04

1. Open a new shell session

2. Run command to open file

sudo gedit /etc/systemd/logind.conf

3. Edit the file to enable hibernate on closing lid

When the file is opened, search for the following line

#HandleLidSwitch=suspend

remove the # to enable the setting and save the changed document

You can also choose one of the following options if suspend is not what you are looking for

HandleLidSwitch=lock – lock when lid closed.
HandleLidSwitch=ignore – do nothing.
HandleLidSwitch=poweroff – shutdown.
HandleLidSwitch=hibernate – hibernate Ubuntu.

4. Apply the changes

Apply the changes by restarting the service

systemctl restart systemd-logind.service

Your system should suspend/hibernate now when you close the lid of your laptop

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If you want to verify if the option you chose is available on your device you can run

sudo systemctl hibernate/suspend/lock