How to enable the hibernate option in Ubuntu 20.04?

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.

1. Install dependencies:

   sudo apt install pm-utils hibernate uswsusp
   

2. 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
   

3. 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"
   

4. Update GRUB:

   sudo update-grub
   

5. 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):

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

1. 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
   

2. 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
   

3. Run:

   sudo /etc/init.d/acpid restart
   

To enable Hibernation in 20.04:

All of the examples on this page seem to be missing resume-offset it is necessary when using a swapfile rather than a swap partition.

Increase swapfile size to match RAM size up to 8GB.

• Check the swap that is in use:

  sudo swapon -s
  

• If swap partition(s) are found:

  sudo swapoff -a
  sudo nano -Bw /etc/fstab
  

• Add # before the UUID of the swap partition(s):

  # UUID=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX   none   swap    sw     0       0
  

• Add a line for the swapfile, if one does not exist:

  /swapfile   none    swap     sw      0       0
  

• Create the swapfile:

  sudo fallocate -l XG /swapfile*
  

  where X is swapfile's size in GB:

  sudo mkswap /swapfile
  sudo chmod 0600 /swapfile
  sudo swapon /swapfile
  

• Reboot:

  sudo reboot
  

Add resume location and offset to grub.cfg:

• Edit /etc/default/grub:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX resume_offset=XXXXX"
  

• Use UUID from root.

• Use offset from:

  sudo filefrag -v /swapfile |grep " 0:"| awk '{print $4}'
  

• Update GRUB:

  sudo update-grub
  

• Test hibernation:

  sudo systemctl hibernate
  

A hibernate button can be added using GNOME extensions.

Note that there is a slight possibility of getting holes in a swapfile when creating it with fallocate. /var/log/syslog can be searched for the phrase swapon: swapfile has holes to ensure there will be no data loss.

A swap file can alternatively be created using dd:

sudo dd if=/dev/zero of=/swapfile bs=1G count=8

An error when using dd may overwrite your HDD.

Using a partition device instead of an UUID

I had to deviate a bit from the "how to" above, probably since I encrypted my hard drive. My /etc/fstab file does not contain an UUID for the swap partition but a partition device.

If your /etc/fstab contains a <partition_device> rather than a UUID for the swap partition, edit the line starting with GRUB_CMDLINE_LINUX_DEFAULT in the file /etc/default/grub to contain resume=<partition_device>

Example:
if /etc/fstab contains this

    # <file system> <mount point>   <type>  <options>       <dump>  <pass>
    /dev/mapper/ubuntu--vg-swap_1 none            swap    sw              0       0

/etc/default/grub should contain the line

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=/dev/mapper/ubuntu--vg-swap_1"

Then execute sudo update-grub and test by executing sudo systemctl hibernate

SuRa's answer at the top works great, however, if your laptop came with a swap file instead of a swap partition then you'll have to follow a few steps first to make it all work. At a high level:

1. Boot from live CD/USB drive, shrink you main partition by the amount of memory you have plus 1-2 GBs for margin. E.g. I have 16 GBs so I shrunk my partition by 18 GB for good measure. That will leave empty/unpartitioned space on your disk.
2. Create a new partition of type swap in the empty/unpartitioned space on your disk.
3. Reboot back into your installed OS (ie without the live CD/USB)
4. Go to "partitions" or "gparted" to get the UUID of your new swap partition.
5. Add your new swap partition to /etc/fstab and delete (or comment out) the old swap file
6. Use the swapoff and swapon commands to switch from the swap file to the swap partition
7. Don't forget to the delete the swap file to reclaim that space
8. Now you can follow SuRa's instructions.

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

1. First ensure you allocate swap memory in your machine to check:

   swapon --show
   

2. Then check whether the swap memory you allocated is more than or at least equal to the Physical memory(RAM).

3. Use the following command to find the swap partition:

   grep swap /etc/fstab
   

4. Copy the UUID of the output for example(UUID=XXXXX-XXX-XXXX-XXXX-YYYYYYYYYY).

5. Add a boot parameter by the following command:

   sudoedit /etc/default/grub
   

6. 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"
   

7. Update the file:

   sudo update-grub
   

8. sudo systemctl hibernate and hibernation will now work in your Ubuntu 20.04.

eldwist's solution worked for me, except...

...not initially, 'cos I got the following error:

$ sudo systemctl hibernate
Failed to hibernate system via logind: Sleep verb not supported

If you get this error, you probably need to disable secure boot under the security menu in the UEFI/BIOS (see similar problem with 16.04). Then it worked for me (tested on Ubuntu 20.04; 5.4.0-33 kernel, configured for Dual-boot with Win10).

I just added a keyboard shortcut. I disabled the Super+H, since I don't need it (the default action is to hide the window) and created a new shortcut with the command:

systemctl hibernate

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

1. Install pm-utils and hibernate:

   sudo apt install pm-utils hibernate
   

2. Then:

   cat /sys/power/state
   

3. You should see:

   freeze mem disk
   

4. Then run one of the following lines:

   grep swap /etc/fstab
   blkid | grep swap
   

5. Copy the UUID value. You will need it later.

6. Then run (use your favorite editor if not nano):

   sudo nano /etc/default/grub
   

7. 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.

8. Then, after saving the file and quitting the text editor, run:

   sudo update-grub
   

9. To test it, run:

   sudo systemctl hibernate
   

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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/ .

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