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

[Michael Hudson-Doyle]

So the (admittedly very obscure) error is that we don't know what to
make of this device:

 P: /devices/virtual/block/dm-8
 N: dm-8
 L: 0
 S: mapper/ventoy
 E: DEVPATH=/devices/virtual/block/dm-8
 E: SUBSYSTEM=block
 E: DEVNAME=/dev/dm-8
 E: DEVTYPE=disk
 E: MAJOR=253
 E: MINOR=8
 E: USEC_INITIALIZED=6700470
 E: DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG=1
 E: DM_UDEV_DISABLE_DISK_RULES_FLAG=1
 E: DM_UDEV_DISABLE_OTHER_RULES_FLAG=1
 E: DM_UDEV_RULES=1
 E: DM_UDEV_RULES_VSN=2
 E: DM_NAME=ventoy
 E: DM_SUSPENDED=0
 E: DEVLINKS=/dev/mapper/ventoy
 E: TAGS=:systemd:

What is it? I can't tell from this fragment! (Not really sure how you
get a device-mapper device without a DM_UUID entry in udev but maybe I'm
misunderstanding something)

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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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