[Bug 1799097] Re: Install selected time zone city (Seattle) hit next hit back hit next then crash

[Iain Lane]

Previously we started installation (restarted debconf and so on) after
committing the partition changes to disk. We changed that to be after
both the timezone step and partitions were committed, because
installation needs to have debconf answers from the timezone stuff.

This bug happens because we do that multiple times if you go between the
step after timezone (user setup) back to timezone itself, and then
forward again. We didn't do anything to prevent installation happening
multiple times. You can't go back to partition committing once you've
been past it (unless it fails), so this bug couldn't happen with the
previous logic.

Another thing could be to move timezone before partitioning, which would
solve the initial bug and not be prone to this regression - in that case
you would lose the parallelisation of doing partitioning while selecting
the timezone. That's why we didn't do it first off. I'm not sure what
"which isn't a much better solution than the two here" is meant to mean
in that sense I'm afraid. Sounds like you're criticising what we did to
fix that bug?

Anyway, if you have smarter ideas, let's hear them. Hopefully you can
understand what the problem is now.

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https://bugs.launchpad.net/bugs/1799097

Title:
  Install selected time zone city (Seattle) hit next hit back hit next
  then crash

Status in ubiquity package in Ubuntu:
  Triaged

Bug description:
  This occurs during install of 18.10 64-bit desktop on VirtualBox
  5.2.20.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: ubiquity 18.10.12
  ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
  Uname: Linux 4.18.0-10-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13
  Architecture: amd64
  CasperVersion: 1.399
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Oct 21 14:59:32 2018
  InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd quiet splash --- maybe-ubiquity
  LiveMediaBuild: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
  ProcEnviron:
   LANGUAGE=en_US.UTF-8
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   LC_NUMERIC=C.UTF-8
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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