Public bug reported:
Stable, well maintained, plain-vanilla 12.04 web server failed the "do-
release-upgrade" procedure to 14.04 while calculating the differences.
Message "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 report this bug using the
command "ubuntu-bug ubuntu-release-upgrader-core""
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager (not installed)
ProcVersionSignature: Ubuntu 3.2.0-39.62-generic 3.2.39
Uname: Linux 3.2.0-39-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.9
Architecture: amd64
Date: Tue Aug 11 08:19:07 2015
MarkForUpload: True
ProcEnviron:
TERM=linux
PATH=(custom, no user)
LANG=POSIX
SHELL=/bin/bash
SourcePackage: update-manager
Symptom: ubuntu-release-upgrader-core
UpgradeStatus: Upgraded to precise on 2015-08-11 (0 days ago)
** Affects: update-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade precise
** Attachment added: "logs.zip"
https://bugs.launchpad.net/bugs/1483742/+attachment/4442893/+files/logs.zip
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https://bugs.launchpad.net/bugs/1483742
Title:
do-release-upgrade 12.04 fails
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