How to enable hibernate on ubuntu 20.04 LTS

Question

How can I enable hibernate on fresh installed system if it's possible.

# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/nvme0n1p2 during installation
UUID=c14a936e-6c0f-4228-beec-c39bc515b157 /               ext4    errors=remount-ro 0       1
# /boot/efi was on /dev/nvme0n1p1 during installation
UUID=1036-AA2D  /boot/efi       vfat    umask=0077      0       1
/swapfile                                 none            swap    sw              0       0

I tried In /ect/default/grub - GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=c14a936e-6c0f-4228-beec-c39bc515b157", but this is not working. Thanks.

score 4 · Answer 1 · edited Jan 23 '21 at 18:56

To enable Hibernation in 20.04:

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.

How to enable hibernate on ubuntu 20.04 LTS

1 Answers1

To enable Hibernation in 20.04:

Linked