Public bug reported:

Ubiquity installer fails with the following steps, booting off a 22.04
LTS USB.

Steps to reproduce:
- Select: *Try or Install Ubuntu [wait for bootup]
- Select: Try Ubuntu (with English) [wait for boot]
- Run "Install Ubuntu 22.04 LTS" icon in the top left corner of the screen 
[Shows Install / Welcome screen]
- Select English, click on Continue
- Select English (US) / English (US) for keyboard layout, click on Continue
- Select Normal Installation, Install thrid-party software, Configute secure 
boot, entered password, click on Continue
- Select Erase disk and install Ubuntu, Advanced features..., Erase disk and 
use ZFS, Encrypt the new Ubuntu installation, click OK, click Install Now
- Enter a security key, click Install Now
- View "Write the changes to disks?" (single drive computer, partitions: vfat, 
swap, bpool, rpool), click Continue
- View "Where are you?", select Los Angeles, click Continue
- Installer crashed.

Looking at /var/log/syslog, I see the following consistently with every
try:

Jun  2 04:16:53 ubuntu ubiquity[6225]: switched to page usersetup
Jun  2 04:16:53 ubuntu ubiquity: Traceback (most recent call last):
Jun  2 04:16:53 ubuntu ubiquity:   File "/usr/share/ubiquity/install.py", line 
769, in <module>
Jun  2 04:16:53 ubuntu ubiquity:     install = Install()
Jun  2 04:16:53 ubuntu ubiquity:   File "/usr/share/ubiquity/install.py", line 
69, in __init__
Jun  2 04:16:53 ubuntu ubiquity:     assert os.path.ismount(self.target), \
Jun  2 04:16:53 ubuntu ubiquity: AssertionError: Failed to mount the target: 
/target

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: ubiquity 22.04.15
ProcVersionSignature: Ubuntu 5.15.0-25.25-generic 5.15.30
Uname: Linux 5.15.0-25-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu82
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.470
Date: Wed Jun  1 21:17:24 2022
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed 
maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug jammy ubiquity-22.04.15 ubuntu

** Attachment added: "/var/log/syslog"
   https://bugs.launchpad.net/bugs/1976585/+attachment/5594430/+files/syslog

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https://bugs.launchpad.net/bugs/1976585

Title:
  Ubiquity Installer Crash (Consistently Repeatable)

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