[Bug 1756862] Re: UIFE - remove ubiquity upgrade option

[Brian Murray]

I've emailed the ubuntu-doc team about this change,
https://lists.ubuntu.com/archives/ubuntu-doc/2018-April/020601.html.

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https://bugs.launchpad.net/bugs/1756862

Title:
  UIFE - remove ubiquity upgrade option

Status in apt-clone package in Ubuntu:
  Confirmed
Status in ubiquity package in Ubuntu:
  Fix Released
Status in apt-clone source package in Bionic:
  Won't Fix
Status in ubiquity source package in Bionic:
  Fix Released

Bug description:
  [Rationale]

  The ubiquity upgrade option, which allows one to upgrade an old
  release of Ubuntu using ubiquity, is crashing when attempting to
  restore the installed packages. Digging into the matter we discovered
  that there are a multitude of reports where the upgrade crashes due to
  a failure to calculate the upgrade and this leaves users in a state
  from which it is hard to recover. Additionally, there have been few
  crashes reported about this process which leads us to believe it is
  not used frequently.

  Original Description
  --------------------
  Test Case:
  1. Install 17.10 and apply all updates
  2. boot the ISO of Ubuntu Desktop 18.04
  3. Launch the install and in the partitioning step, select Upgrade from 17.10 to 18.04
  4. Proceed with the rest of the installation

  Expected result
  The system upgrades successfully to 18.04

  Actual result
  This crash

  ProblemType: CrashDistroRelease: Ubuntu 18.04
  Package: apt-clone 0.4.1ubuntu2
  ProcVersionSignature: Ubuntu 4.15.0-12.13-generic 4.15.7
  Uname: Linux 4.15.0-12-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  CasperVersion: 1.389
  Date: Mon Mar 19 12:59:14 2018
  ExecutablePath: /usr/bin/apt-clone
  InterpreterPath: /usr/bin/python3.6
  LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180317)
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python3 /usr/bin/apt-clone restore-new-distro /target/ubiquity-apt-clone/apt-clone-state-hostname.tar.gz bionic --destination /target
  Python3Details: /usr/bin/python3.6, Python 3.6.5rc1, python3-minimal, 3.6.4-1
  PythonArgs: ['/usr/bin/apt-clone', 'restore-new-distro', '/target/ubiquity-apt-clone/apt-clone-state-hostname.tar.gz', 'bionic', '--destination', '/target']
  PythonDetails: /usr/bin/python2.7, Python 2.7.14+, python-minimal, 2.7.14-4SourcePackage: apt-clone
  Title: apt-clone crashed with SystemError in commit(): installArchives() failed
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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