[Bug 1881588] Re: pre-seeding lxd on Core appliances breaks console-conf user creation

[Ian Johnson]

I verified that mwhudson's PR is sufficient for UC20 at least, provided
it is changed slightly to account for the actual JSON structure. I built
a core20 snap with the new python dependencies that console-conf has,
and updated the things that the PR changes in the core20 snap and built
a snap with the lxd, core18, snapd, pc, core20, and pc-kernel snaps
seeded and I was able to use console-conf to create a user. I also
verified that the lxd snap had created the lxd user entry in extrausers
passwd before running console-conf and it created lxd first, verifying
the fix.

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https://bugs.launchpad.net/bugs/1881588

Title:
  pre-seeding lxd on Core appliances breaks console-conf user creation

Status in snapd:
  Invalid
Status in subiquity:
  In Progress
Status in subiquity package in Ubuntu:
  Invalid
Status in subiquity source package in Xenial:
  Confirmed
Status in subiquity source package in Bionic:
  Confirmed

Bug description:
  when seeding appliance images with lxd, user creation gets impossible.

  console-conf skips the user creation, system-user assertions do not
  work either because there is already a user exisiting in the image.

  the tty screen shows instructions to log in with "lxd@<IP ADDRESS>"
  ...

  since the lxd user is a special case hack in Ubuntu Core images, "snap
  create-user ..." should probably learn to ignore its existence ...

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