Enable Hibernate mode on Ubuntu 25.04 (Plucky Puffin): A Step-by-Step Guide

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• Hibernation is not enabled by-default in Ubuntu.

• If you try to hibernate using “sudo systemctl hibernate”, you will run into the below error:

call to Hibernate failed: Not enough suitable swap space for hibernation available on compatible block devices and file systems

• Hibernation requires a swap space at least equal to your system’s RAM.

• If the swap size is less than your RAM, you’ll need to increase it.

Check current swap usage:

swapon --show

free -h

Depending on your configuration, you either might see:

• A swap partition:

• OR a swap file:

If you don’t have a swap partition, Create a Dedicated Swap Partition.

Creating a Dedicated Swap Partition

• Make sure the swap partition is equal or more then your RAM size.

• Resize an existing partition with GParted and create a Linux swap partition.

Format and enable the swap:

• Identify the correct device name and use the below commands to enable the swap

• In my case the partition is /dev/nvme0n1p3

sudo mkswap /dev/nvme0n1p3
sudo swapon /dev/nvme0n1p3

Find the UUID of the partition:

sudo blkid /dev/nvme0n1p3

Add to /etc/fstab:

UUID="XXXXXX-XXXXX-XXX-XXX-XXXXXXXX" none swap sw 0 0

• Reboot and verify the new swap is active

Edit GRUB configuration:

sudo nano /etc/default/grub

• Find the line starting with GRUB_CMDLINE_LINUX_DEFAULT and add the resume parameter:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=your-swap-uuid"

Replace your-swap-uuid with the UUID you noted earlier

• Update GRUB:

sudo update-grub

• Rebuild initramfs to include resume info & reboot

sudo update-initramfs -u

sudo reboot

Enable Hibernate in PolicyKit:

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

• Add the following content to the config:

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;
}
});

Test Hibernation:

sudo systemctl hibernate

GUI Hibernate button:

You can also add a Hibernate button in Status menu using this gnome extension

https://extensions.gnome.org/extension/755/hibernate-status-button/