[Bug 1934195] Re: Crashes on attempt to install to btrfs-on-LUKS2 root

[Paul White]

Thank you for taking the time to report this bug and helping to make
Ubuntu better. We are sorry that we do not always have the capacity to
review all reported bugs in a timely manner.

Ubiquity is now unmaintained as it has been replaced by either the
Ubuntu Desktop Installer or Calamares starting with Ubuntu 24.04 LTS.
Therefore, this bug is being closed as 'Invalid'.

If you believe this was done in error, please feel free to re-open the
bug report.

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** Changed in: ubiquity (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1934195

Title:
  Crashes on attempt to install to btrfs-on-LUKS2 root

Status in ubiquity package in Ubuntu:
  Invalid

Bug description:
  Specific install scenario:
  - Encrypted (LUKS2) btrfs volume (pre-formatted) set to be used as "/" in Ubiquity
  - The concerned btrfs volume had a custom default subvolume (not FS_ROOT)
  - A separate encrypted, pre-formatted physical swap partition was selected.
    On one occasion, Ubiquity crashed while trying to `mkswap` on this partition

  To reproduce:
  - On a VM (this happened on a VM), pass-through a USB 3.0 drive
  - luksFormat a 40GB partition (LUKS2)
  - Run mkfs.btrfs -K (I didn't want to send a bunch of TRIMs)
  - Create a subvolume and set it as the default one (`btrfs subvolume set-default` was used)
  - Create another 2GB LUKS2 partition, but this time run mkswap
  - Ensure that the new swap partition is not being used (swapoff <new-mapped-part>
  - Fire up Ubiquity
  - Select these two partitions as "/" and swap space respectively. Ensure "format" is UNCHECKED
  - "Install Now"
  - Confirm partition map changes, as well as non-formatting of the "/" partition
  - Sit back and wait for the crash (which you hopefully don't experience, but I have a bad feeling...)

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubiquity 20.04.15.10
  ProcVersionSignature: Ubuntu 5.8.0-43.49~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-43-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  CasperMD5CheckResult: skip
  CasperVersion: 1.445.1
  Date: Thu Jul  1 02:58:14 2021
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
  LiveMediaBuild: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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