How to enable the hibernate option in Ubuntu 20.04?

I assume you have a swap partition ready to use (if you have a swap file you cannot hibernate). Follow these steps:

Install pm-utils and hibernate:
```
sudo apt install pm-utils hibernate
```
Then:
```
cat /sys/power/state
```
You should see:
```
freeze mem disk
```
Then run one of the following lines:
```
grep swap /etc/fstab
blkid | grep swap
```
Copy the UUID value. You will need it later.
Then run (use your favorite editor if not nano):
```
sudo nano /etc/default/grub
```

Change the line that says:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

so that it instead says:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=<YOUR_COPIED_UUID>"

Be careful not to miss the UUID= part.

Then, after saving the file and quitting the text editor, run:
```
sudo update-grub
```
To test it, run:
```
sudo systemctl hibernate
```

This extension seems to enable showing the "Hibernate" menu entry, but it changes the overall look of this sub-menu: https://extensions.gnome.org/extension/3070/simpler-off-menu/ .

Tested on Ubuntu 20.04 using kernel version 5.4.0-31 on my Lenovo ThinkPad X1 Carbon.

If you want to use a /swapfile to hibernate instead of the swap partition:

The top answer works well, but you don't have to use a partition, you can also use a default /swapfile.

First of all, you should increase the size of the /swapfile at least to the size of your RAM.

Install dependencies:

sudo apt install pm-utils hibernate uswsusp

Find your UUID and swap offset:

findmnt -no UUID -T /swapfile && sudo swap-offset /swapfile

You will see something like this:

371b1a95-d91b-49f8-aa4a-da51cbf780b2
resume offset = 23888916

Edit /etc/default/grub and replace the string:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

with your UUID and offset:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=371b1a95-d91b-49f8-aa4a-da51cbf780b2 resume_offset=23888916"

Update GRUB:
```
sudo update-grub
```
Test your hibernation:
```
sudo systemctl hibernate
```

Probably you should not change the size of your swap after enabling the hibernation (at least without changing the swap-offset in GRUB).

See wiki for more details.

EXTRA BONUS: If you want to hibernate when a laptop lid is closed (see this):

Disable any options in the settings that touch the laptop lid, set them to "do nothing".

Run:

sudo mkdir -p /etc/acpi/events/ && sudo nano /etc/acpi/events/laptop-lid

and paste:

event=button/lid.*
action=/etc/acpi/laptop-lid.sh

Run:

sudo touch /etc/acpi/laptop-lid.sh && sudo chmod +x /etc/acpi/laptop-lid.sh && sudo nano /etc/acpi/laptop-lid.sh

and paste:

#!/bin/bash

LOG_FILE='/var/log/laptop-lid.log'
touch $LOG_FILE && chmod 0666 $LOG_FILE

grep -q closed /proc/acpi/button/lid/LID/state
if [ $? = 0 ]
then
    # close action
    echo "$(date '+%Y.%m.%d %H:%M:%S.%3N'): closed" >> $LOG_FILE
    systemctl hibernate
else
    # open action
    echo "$(date '+%Y.%m.%d %H:%M:%S.%3N'): opened" >> $LOG_FILE
fi

Run:
```
sudo /etc/init.d/acpid restart
```

And if you want to turn on hibernation in your Ubuntu 20.04*, follow these steps:

First ensure you allocate swap memory in your machine to check:
```
swapon --show
```
Then check whether the swap memory you allocated is more than or at least equal to the Physical memory(RAM).
Use the following command to find the swap partition:
```
grep swap /etc/fstab
```
Copy the UUID of the output for example(UUID=XXXXX-XXX-XXXX-XXXX-YYYYYYYYYY).
Add a boot parameter by the following command:
```
sudoedit /etc/default/grub
```
At the line starting with GRUB_CMDLINE_LINUX_DEFAULT, add:
```
resume=UUID=XXXXX-XXX-XXXX-XXXX-YYYYYYYYYY
```
Note: In all other threads they used to ask to add swap partition but here we are adding the UUID value.

The final line will be like:
```
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=XXXXX-XXX-XXXX-XXXX-YYYYYYYYYY"
```
Update the file:
```
sudo update-grub
```
sudo systemctl hibernate and hibernation will now work in your Ubuntu 20.04.

How to enable the hibernate option in Ubuntu 20.04?

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