upgrade from 16.04 to 18.04 uncalculatable due to fpc packages

Bug #1786486 reported by Luiz Coutinho on 2018-08-10
This bug affects 5 people
Affects Status Importance Assigned to Milestone
fpc (Debian)
Fix Committed
fpc (Ubuntu)

Bug Description

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)

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

Luiz Coutinho (lffc60) wrote :
tags: added: xenial2bionic
Brian Murray (brian-murray) wrote :

I was able to recreate this bug by using the apt-clone file in it, after restoring the clone file the upgrade failed to calculate. When I removed the fpc package the upgrade was calculatable so it seems to be an issue with the fpc packages.

summary: - upgrade 16.04 to 18.04
+ upgrade from 16.04 to 18.04 uncalculatable due to fpc packages
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in ubuntu-release-upgrader (Ubuntu):
status: New → Confirmed
Changed in fpc (Ubuntu):
status: New → Confirmed
importance: Undecided → Medium
Changed in fpc (Debian):
status: Unknown → New
Julian Andres Klode (juliank) wrote :

I believe it's a problem with fp-units-base-3.0.4 Breaks fp-units-misc-3.0.0 (<= 3.0.0+dfsg-2), as that prevents the old versions from remaining installed. Needs verification to make sure.

Julian Andres Klode (juliank) wrote :

Just verified, this solves the bug.

Changed in ubuntu-release-upgrader (Ubuntu):
status: Confirmed → Won't Fix
Changed in fpc (Ubuntu):
status: Confirmed → In Progress
description: updated
Changed in fpc (Ubuntu):
status: In Progress → Fix Committed
Changed in fpc (Ubuntu Bionic):
status: New → In Progress
no longer affects: ubuntu-release-upgrader (Ubuntu)
no longer affects: ubuntu-release-upgrader (Ubuntu Bionic)
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package fpc - 3.0.4+dfsg-20ubuntu1

fpc (3.0.4+dfsg-20ubuntu1) cosmic; urgency=medium

  * Remove wrong fp-units-base-3.0.4 Breaks fp-units-misc-3.0.0, this breaks
    upgrades from xenial (LP: #1786486)

 -- Julian Andres Klode <email address hidden> Wed, 29 Aug 2018 22:34:16 +0200

Changed in fpc (Ubuntu):
status: Fix Committed → Fix Released

Hello Luiz, or anyone else affected,

Accepted fpc into bionic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/fpc/3.0.4+dfsg-18ubuntu2 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed.Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-bionic to verification-done-bionic. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-bionic. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

Changed in fpc (Ubuntu Bionic):
status: In Progress → Fix Committed
tags: added: verification-needed verification-needed-bionic
Changed in fpc (Debian):
status: New → Fix Committed
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