After setting up hibernation on my encrypted disk with LVM2 (standard ubuntu 20.04 Focal installation with encryption) it finally worked... once!
I installed pm-utils, uswsusp and hibernation packages - added and configured a swapfile on my root partition - setup grub and initramfs with the correct partition UUID and resume_offset of the swap and updated both. After a lot of trial and error with systemctl hibernate and different UUID the command "sudo pm-hibernate" wrote image with s2disk to swap and when booting up it loaded it from swap and booted with apps open. It then locked the screen for user login and as this annoyed me I disabled this in the privacy settings and hibernated again. With the lockscreen login still happening I rebooted without hibernation. I changed nothing else.
After reboot I used the same command to hibernate again "sudo pm-hibernate". It wrote images to swap via s2disk and shutdown. Booting up then failed and still does and I have tried everything and I just cant figure out why it would work and a simple reboot would stop it from working. I tried resetting all the privacy settings but still fails and no guide or forum posts worked for me.
After decrypting my disk with the correct password it writes the following and only hard shutdown will reboot a clean ubuntu and no hibernation image. Any idea what happened or what I can do to make it work again?
cryptsetup: sda3_crypt: set up successfully resume: Compressed image Loading image data pages (365257 pages)... 0% Error while writing an image page: Operation not permitted
The system snapshot image could not be read. This might be a result of booting a wrong kernel.
You can now boot the system and lose the saved state or reboot and try again.
(Notice that if you decide to reboot, you MUST NOT mount any filesystems before a successful resume. Resuming after some filesystems have been mounted will badly damage these filesystems. ) Do you want to continue booting (Y/n)?
