[Bug 1954635] [NEW] subiquity crashes when attempting advanced network/disk configuration

[Todd Taft]

Public bug reported:

Subiquity for 20.04 crashes and a system install attempt fails when
attempting to do an install with a complex network or disk
configuration.

When attempting an install with a semi-complex configuration (e.g.
multiple network interfaces bonded together using LACP or multiple
partitions with LVM, tmpfs, and swap), the installer will crash and
fail.

I am attempting an automated install using ISOs generated by the scripts
at https://github.com/covertsh/ubuntu-autoinstall-generator and I am
attempting to use the daily Ubuntu ISOs downloaded by that script.  The
user-data file that is attached fails with the current Ubuntu ISO
download; however, it works with a daily ISO download that I made on
2021-12-03, so it appears that something broke on or after that date.

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

** Attachment added: "Full user-data file"
   https://bugs.launchpad.net/bugs/1954635/+attachment/5547283/+files/generic-focal-p340-share.cfg

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https://bugs.launchpad.net/bugs/1954635

Title:
  subiquity crashes when attempting advanced network/disk configuration

Status in subiquity package in Ubuntu:
  New

Bug description:
  Subiquity for 20.04 crashes and a system install attempt fails when
  attempting to do an install with a complex network or disk
  configuration.

  When attempting an install with a semi-complex configuration (e.g.
  multiple network interfaces bonded together using LACP or multiple
  partitions with LVM, tmpfs, and swap), the installer will crash and
  fail.

  I am attempting an automated install using ISOs generated by the
  scripts at https://github.com/covertsh/ubuntu-autoinstall-generator
  and I am attempting to use the daily Ubuntu ISOs downloaded by that
  script.  The user-data file that is attached fails with the current
  Ubuntu ISO download; however, it works with a daily ISO download that
  I made on 2021-12-03, so it appears that something broke on or after
  that date.

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