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

[Brandon McKean]

We encountered this on a server build on 22.04, though admittedly a
daily image before the final was created.

While we didn't save the log, we encountered the same sort of behavior
you did. Going off of Michael's comment and reading the logs, it looks
like Todd was using Ventoy, which we were also using as well as
complicated networking and partitioning.

For reference, Ventoy is software to run bootable iso files from a drive
rather than needing to directly writing them to said drive.

When we did the installation with the final iso directly written to a
flash drive, and did the same installation procedure, everything worked
perfectly.

I think this error is due to something Ventoy is doing that the
installer doesn't like. Whether or not that is something that is
considered Ubuntu's fault, I'm not sure.

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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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