[Bug 2019093] Re: ubiquity --no-bootloader crashes trying install to sdb using gpt, swap, efi, and btrfs partition

[Lorin K]

from UbiquitySyslog.txt:
May 10 08:47:13 ubuntu ubiquity[64126]: Starting the installation
May 10 08:47:13 ubuntu ubiquity[64126]: debconffilter_done: ubiquity.components.partman_commit (current: ubi-usersetup)
May 10 08:47:13 ubuntu ubiquity: Traceback (most recent call last):
May 10 08:47:13 ubuntu ubiquity:   File "/usr/share/ubiquity/install.py", line 769, in <module>
May 10 08:47:13 ubuntu ubiquity:     install = Install()
May 10 08:47:13 ubuntu ubiquity:   File "/usr/share/ubiquity/install.py", line 69, in __init__
May 10 08:47:13 ubuntu ubiquity:     assert os.path.ismount(self.target), \
May 10 08:47:13 ubuntu ubiquity: AssertionError: Failed to mount the target: /target

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Title:
  ubiquity --no-bootloader crashes trying install to sdb using gpt,
  swap,efi, and btrfs partition

Status in ubiquity package in Ubuntu:
  New

Bug description:
  expected: no crash
  actual: crash shortly after the partition prompt after clicking "Install Now".

  
  note i tried twice. first with crypt then without. Even re-formatted and tried without crypt and got a crash again.

  Was following tutorial by mutschler.dev titled "Ubuntu Desktop 20.04:
  installation guide with btrfs-luks full disk encryption including
  /boot and auto-apt snapshots with Timeshift"

  lsb_release -rd
  Description:	Ubuntu 22.04.1 LTS
  Release:	22.04

  apt-cache policy ubiquity
  ubiquity:
    Installed: 22.04.17
    Candidate: 22.04.19
    Version table:
       22.04.19 500
          500 http://archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages
   *** 22.04.17 100
          100 /var/lib/dpkg/status
       22.04.15 500
          500 http://archive.ubuntu.com/ubuntu jammy/main amd64 Packages

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: ubiquity 22.04.17 [modified: lib/partman/fstab.d/btrfs lib/partman/mount.d/70btrfs]
  ProcVersionSignature: Ubuntu 5.15.0-43.46-generic 5.15.39
  Uname: Linux 5.15.0-43-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu82.1
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.470
  Date: Wed May 10 10:48:03 2023
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
  LiveMediaBuild: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809.1)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
   LC_NUMERIC=C.UTF-8
  RebootRequiredPkgs: Error: path contained symlinks.
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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