[Bug 1786486] Re: upgrade from 16.04 to 18.04 uncalculatable due to fpc packages

[Julian Andres Klode]

** Changed in: fpc (Ubuntu Bionic)
       Status: New => In Progress

** No longer affects: ubuntu-release-upgrader (Ubuntu)

** No longer affects: ubuntu-release-upgrader (Ubuntu Bionic)

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https://bugs.launchpad.net/bugs/1786486

Title:
  upgrade from 16.04 to 18.04 uncalculatable due to fpc packages

Status in fpc package in Ubuntu:
  Fix Committed
Status in fpc source package in Bionic:
  In Progress
Status in fpc package in Debian:
  New

Bug description:
  [Impact]
  Upgrades from 16.04 to 18.04 might fail if fpc packages are installed, as fp-units-base-3.0.4 Breaks fp-units-misc-3.0.0 (<= 3.0.0+dfsg-2); a leftover from fp-units-base-3.0.0 that should have been removed (all paths in the deb are versioned).

  [Test case]
  1. Extract dpkg status from apt clone system state in comment #1 and run apt dist-upgrade against it in a bionic system
  2. Restore apt-clone and run ubuntu-release-upgrader

  [Regression potential]
  Since all paths are versioned, there should be no regressions.

  [Original bug report]

  it aborts in second step.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-131.157-generic 4.4.134
  Uname: Linux 4.4.0-131-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Aug 10 11:06:26 2018
  InstallationDate: Installed on 2015-06-30 (1137 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-10 (0 days ago)
  VarLogDistupgradeTermlog:

  modified.conffile..etc.update-manager.release-upgrades: [modified]
  mtime.conffile..etc.update-manager.release-upgrades: 2018-08-10T07:52:29.705103

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