Hibernate on Ubuntu 18.04 with LVM full-disk encryption

crypttab

sda5_crypt UUID=c66880c1-c2f1-40fc-9580-f25d493876ef none luks,discard

fstab

# /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>
/dev/mapper/ubuntu--vg-root /               ext4    errors=remount-ro 0       1
# /boot was on /dev/sda1 during installation
UUID=3a4152dc-b401-4ae3-96b7-b8da7d918023 /boot           ext4    defaults        0       2
/dev/mapper/ubuntu--vg-swap_1 none            swap    sw              0       0

intro.md

$ swapon -s
Filename				Type		Size	Used	Priority
/dev/dm-2                              	partition	16777212	0	-2

texas:~$ sudo lvdisplay
[sudo] password for tim: 
  --- Logical volume ---
  LV Path                /dev/ubuntu-vg/root
  LV Name                root
  VG Name                ubuntu-vg
  LV UUID                vEByY0-UUvE-OgLU-caQo-gku0-yt05-9l70KP
  LV Write Access        read/write
  LV Creation host, time ubuntu, 2018-07-07 15:08:49 +0100
  LV Status              available
  # open                 1
  LV Size                420.00 GiB
  Current LE             107520
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
   
  --- Logical volume ---
  LV Path                /dev/ubuntu-vg/swap_1
  LV Name                swap_1
  VG Name                ubuntu-vg
  LV UUID                L3AKIc-rK4X-uy4l-jFuM-C1fc-TrNt-yodzsL
  LV Write Access        read/write
  LV Creation host, time ubuntu, 2018-07-07 15:08:49 +0100
  LV Status              available
  # open                 2
  LV Size                16.00 GiB
  Current LE             4096
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2

The fix

Edit /etc/initramfs-tools/conf.d/resume:

RESUME=/dev/mapper/ubuntu--vg-swap_1

Edit /etc/default/grub:

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

sudo update-initramfs -u -k all
sudo update-grub

logind.conf

HandleSuspendKey=hibernate
HandleLidSwitch=hybrid-sleep

@davidhackn for me 20.04 and 22.04 did not require to do anything at all to have hibernation working (I install ubuntu's using this guide: https://help.ubuntu.com/community/Full_Disk_Encryption_Howto_2019)

ps: gnight :-D

I suspect that all data in memory will be saved to disk unencrypted. then why would you need to encrypt the entire disk? for safety? this way you save all the RAM in unencrypted form... for safety?..