"sudo systemctl start hibernate.target" worked fine with 16.04 on a Acer B117 using legacy boot; Updating to 18.04 forced me to use UEFI and (Acer requirement) secure boot enabled. Suspend still works, but I need hibernate.

Swap partition is active and equals RAM size + 2GB;

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=myswapuuid"

journalctl -xe revealed failure to access /sys/power/disk

cat /sys/power/disk: [disabled]

cat /sys/power/state: freeze mem

Any suggestions?


2 Answers 2


I have the same problem and, unfortunately, it's impossible with the official Ubuntu kernel since version 4.13 due to kernel lockdown patchset (efi-lockdown). Substantiation is:

There is currently no way to verify the resume image when returning from hibernate. This might compromise the signed modules trust model, so until we can work with signed hibernate images we disable it when the kernel is locked down.

Related Bionic commit you can see here.

This is a controversial decision and Linus declined to merge these changes to linux kernel.

A bit more details you can find is the article Kernel lockdown in 4.17? and its comments.

So while we wait some magic software, that will work with signed hibernate images, we can only use another kernel or disable secure boot.

  • 1
    What kernel could I use? Hibernation is an essential feature to me. (I expect I must have one newer than 4.15, ideally 4.18, as my WiFi works on the latter, but not the former.)
    – nsandersen
    Jun 8, 2019 at 19:27
  • @morgwai I'm sorry for your lost. After I encountered a similar case, I set up CriticalPowerAction to Hibernate and low battery notifications according to this post — askubuntu.com/a/800398/865173 It's better to leave more time for hibernation, for example 1200/600/300.
    – Snaker
    Apr 24, 2020 at 13:01
  • 1
    btw: I think this limitation does not make sense if the swap is on an encrypted drive, right? is there any launchpad bug/feature request where we can upvote enabling hibernation on secure-boot+encrypted-swap? ;-)
    – morgwai
    May 18, 2020 at 6:10
  • The "magic software" has now appeared: lore.kernel.org/lkml/…. In kernels that have this merged, hibernation and secure boot should work together.
    – Nikratio
    Sep 4, 2021 at 19:40
  • 1
    I think the patch set might be paused? mjg59.dreamwidth.org/55845.html lwn.net/ml/linux-kernel/… Jul 23, 2022 at 17:40

I was able to hibernate using s2disk or pm-hibernate, but resume was failing. To fix this, as my system is booted up using UEFI instead of grub. I just had to reinstall the boot loader. To check if you are running UEFI use the following:

[ -d /sys/firmware/efi ] && echo "Installed in UEFI mode" || echo "Installed in Legacy mode"

if in UEFI mode, then I followed this guide to reinstall the bootloader, it varies if you are using an nvme disk or sata disk: https://support.system76.com/articles/bootloader/

The key is to run this command:

sudo update-initramfs -c -k all

make sure that in your kernalboot options you specify the partition or UUID of where to resume from, eg something like this:


You can add this by either:

  1. sudo kernel-stub -a "resume=UUID=..."
  2. edit the /etc/initramfs-tools/conf.d/resume file and add: resume=UUID=ed8347ed-2eb4-40bc-bc77-cc53b987ed88

check your /var/log/syslog file for something like this:

Aug  4 22:26:42 pop-os /usr/bin/kernelstub[19639]: kernelstub           : DEBUG    kopts: root=UUID=b37019a8-91f5-445f-94c1-7359a49ed5df ro quiet loglevel=0 systemd
.show_status=false resume=UUID=ed8347ed-2eb4-40bc-bc77-cc53b987ed88

If the resume is missing or wrong then you'll need to update your boot kernal again.

  • Thanks, this is the only answer that allowed me to resume without issue. Nov 27, 2019 at 15:47
  • As a user of encryption, I did not need to change the initramfs, but I did have to disable cryptswap and re-enable normal swap by uncommenting and commenting appropriately in /etc/fstab and /etc/crypttab. cryptswap uses a random key each boot so doesn't work for hibernation.
    – fuzzyTew
    Feb 13, 2020 at 12:40
  • If you want an encrypted swap partition, you can take a look at this: help.ubuntu.com/community/EnableHibernateWithEncryptedSwap
    – Lingster
    Feb 15, 2020 at 17:54

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