[Bug 2067622] Re: cryptsetup-initramfs disappeared during upgrade from 23.10 to 24.04 leading to failing boot

[Nick Rosbrook]

** Changed in: ubuntu-release-upgrader (Ubuntu Oracular)
       Status: New => Fix Committed

** Changed in: ubuntu-release-upgrader (Ubuntu Noble)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/2067622

Title:
  cryptsetup-initramfs disappeared during upgrade from 23.10 to 24.04
  leading to failing boot

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Committed
Status in ubuntu-release-upgrader source package in Noble:
  In Progress
Status in ubuntu-release-upgrader source package in Oracular:
  Fix Committed

Bug description:
  [Impact]

  If an upgrade removes cryptsetup-initramfs, the system can then fail
  to boot.

  [Test Plan]

  We don't currently have a reproducer for this scenario, so we need to
  test that cryptsetup-initramfs is listed in the removal_denylist.cfg
  during upgrades to Noble.

  1. Start an upgrade

  $ do-release-upgrade

  2. In another terminal, after the tarball has been downloaded and
  unpacked, find the temp directory

  $ tmpdir="$(find /tmp -name ubuntu-release-upgrader-* -type d)"

  3. Check that cryptsetup-initramfs is in the removal deny list:

  grep "cryptsetup-initramfs" "$tmpdir/removal_denylist.cfg"

  It should be listed there.

  [Where problems could occur]

  If there was a typo in the patch, the entry would not correctly match
  the cryptsetup-initramfs package name, and would therefore not prevent
  removal during upgrades.

  [Original Description]

  I have a system with a full-disk encryption installed with 23.10.
  After doing an upgrade to 24.04 from command line using `do-release-
  upgrade` (everything went without a problem), I rebooted and got a
  initramfs prompt complaining about root filesystem not being
  available.

  I was able to boot using the kernel from the previous version (6.5.0)
  and after inspecting the system, I found that the `cryptsetup-
  initramfs` package was not installed. After installing it, it produced
  a new and slightly larger initramfs. With it, I was able to boot with
  the 6.8.0 kernel.

  From the upgrade logs, I can see the following:

  ```
  Investigating (0) cryptsetup-initramfs:amd64 < 2:2.7.0-1ubuntu4 @ii gK Ib >
  Broken cryptsetup-initramfs:amd64 Depends on cryptsetup:amd64 < 2:2.7.0-1ubuntu4 @ii pgP > (>= 2:2.7.0-1ubuntu4)
    Considering cryptsetup:amd64 10000 as a solution to cryptsetup-initramfs:amd64 0
    Removing cryptsetup-initramfs:amd64 rather than change cryptsetup:amd64
  ```

  Which I think is the culprit of the problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: ubuntu-release-upgrader-core 1:24.04.18
  ProcVersionSignature: Ubuntu 6.8.0-31.31-generic 6.8.1
  Uname: Linux 6.8.0-31-generic x86_64
  NonfreeKernelModules: zfs nvidia_modeset nvidia
  ApportVersion: 2.28.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: pass
  CrashDB: ubuntu
  CurrentDesktop: MATE
  Date: Thu May 30 16:37:39 2024
  InstallationDate: Installed on 2024-02-25 (95 days ago)
  InstallationMedia: Ubuntu-MATE 23.10 "Mantic Minotaur" - Release amd64 (20231010)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to noble on 2024-05-30 (0 days ago)
  VarLogDistupgradeXorgFixuplog:
   INFO:root:/usr/bin/do-release-upgrade running
   INFO:root:No xorg.conf, exiting

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