Public bug reported:
1. installed 12.04 and upgraded to 14.04 successfully
2. Change upgrade-manager from "long term releases only" to "any
release"
3. add
4. do-release-upgrade
"An unresolvable problem occurred while calculating the upgrade.
This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unofficial software packages not provided by Ubuntu
If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. "
This shouldn't be right:
* it's not a prerelease version - it's 14.04 the LTS version
* It's upgrading to a version that has been stable for quite some time
* there shouldn't be any packages that aren't provided by ubuntu - it's pretty
close to only what was running on 12.04 for that particular upgrade
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.13.0-74.118-generic 3.13.11-ckt30
Uname: Linux 3.13.0-74-generic i686
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
CrashDB: ubuntu
Date: Mon Jan 18 17:10:04 2016
InstallationDate: Installed on 2016-01-16 (2 days ago)
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release i386
(20130213)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-01-18 (0 days ago)
mtime.conffile..etc.update.manager.release.upgrades: 2016-01-18T17:00:47.220347
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug dist-upgrade i386 trusty
** Attachment added: "dpkg"
https://bugs.launchpad.net/bugs/1535475/+attachment/4552242/+files/dpkg
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https://bugs.launchpad.net/bugs/1535475
Title:
An unresolvable problem occurred from 14.04 to 15.10
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