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

[Łukasz Zemczak]

Also, before we actually proceed with releasing this to -updates, can
you provide a Regression Potential (aka. [Where problems could occur])
section to the bug description? The test-case is quite good, but it
would be also necessary to think of all the regression scenarios this
could cause - especially for a package like cryptsetup.

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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:
  Fix Committed
Status in cryptsetup source package in Jammy:
  Fix Committed
Status in cryptsetup source package in Kinetic:
  Fix Committed

Bug description:
  [Impact]

  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.

  [Test Plan]

  Test a fresh installation:

  * Use Ubuntu 22.04 installer
  * Prepare encrypted disk layout (first partition /boot, second for /) and go one step back
  * Then change hash in terminal
  ```
  sudo cryptsetup close vda2_crypt
  sudo cryptsetup luksFormat --hash=whirlpool /dev/vda2
  sudo cryptsetup luksOpen /dev/vda2 vda2_crypt
  sudo mkfs.ext4 /dev/mapper/vda2_crypt
  ```
  * Continue and complete installation
  * Ensure that /target/etc/crypttab exists (if not, create it and run "update-initramfs -u" in "chroot /target")
  * Reboot
  * The system should ask for the password during boot and successfully boot into the desktop

  Test an upgrade:

  * Install Ubuntu 20.04 (similar to above)
  * Upgrade to Ubuntu 22.04
  * Reboot
  * The system should ask for the password during boot and successfully boot into the desktop

  [Workaround]
  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.  Mark the file as executable: chmod +x /etc/initramfs-tools/hooks/custom-add-openssl-compat.conf
  5.  Regenerating the initramfs.  ie. update-initramfs -k all -u

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