[Bug 1979159] [NEW] Cannot unlock encrypted root after upgrading to 22.04

[fedorowp]

Public bug reported:

After upgrading to Ubuntu 22.04 with an encrypted root filesystem, the
root drive can no longer be unlocked at the "Please unlock disk
<diskname>" prompt on boot.

The encrypted root disk can be unlocked fine from the liveCD, but not
from the initramfs environment on boot.

The issue is caused by support for various luks encryption protocols now
being missing from the initramfs environment due to changes introduced
in OpenSSL 3.0 and Ubuntu pre-release testing not including a test-case
of upgrading older Ubuntu versions with an encrypted root to the new
version.

The issue can be worked-around by:
1.  Booting from the 22.04 liveCD.
2.  chrooting into the target system's root.
       See https://help.ubuntu.com/community/ManualFullSystemEncryption/Troubleshooting
3.  Creating a file /etc/initramfs-tools/hooks/custom-add-openssl-compat.conf containing:
---
. /usr/share/initramfs-tools/hook-functions
copy_exec /usr/lib/x86_64-linux-gnu/ossl-modules/legacy.so /usr/lib/x86_64-linux-gnu/ossl-modules/
---
4.  Regenerating the initramfs.  ie. update-initramfs -k all -u

** Affects: cryptsetup (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1979159

Title:
  Cannot unlock encrypted root after upgrading to 22.04

Status in cryptsetup package in Ubuntu:
  New

Bug description:
  After upgrading to Ubuntu 22.04 with an encrypted root filesystem, the
  root drive can no longer be unlocked at the "Please unlock disk
  <diskname>" prompt on boot.

  The encrypted root disk can be unlocked fine from the liveCD, but not
  from the initramfs environment on boot.

  The issue is caused by support for various luks encryption protocols
  now being missing from the initramfs environment due to changes
  introduced in OpenSSL 3.0 and Ubuntu pre-release testing not including
  a test-case of upgrading older Ubuntu versions with an encrypted root
  to the new version.

  The issue can be worked-around by:
  1.  Booting from the 22.04 liveCD.
  2.  chrooting into the target system's root.
         See https://help.ubuntu.com/community/ManualFullSystemEncryption/Troubleshooting
  3.  Creating a file /etc/initramfs-tools/hooks/custom-add-openssl-compat.conf containing:
  ---
  . /usr/share/initramfs-tools/hook-functions
  copy_exec /usr/lib/x86_64-linux-gnu/ossl-modules/legacy.so /usr/lib/x86_64-linux-gnu/ossl-modules/
  ---
  4.  Regenerating the initramfs.  ie. update-initramfs -k all -u

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