Public bug reported:
I typed:
$ sudo do-release-upgrade
but unfortunately it was failed with error "An unresolvable problem
occured while calculating the upgrade.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.21
ProcVersionSignature: Ubuntu 3.13.0-107.154~precise1-generic 3.13.11-ckt39
Uname: Linux 3.13.0-107-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.15
Architecture: amd64
Date: Thu Jan 12 17:02:14 2017
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120423)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
TERM=linux
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: update-manager
Symptom: ubuntu-release-upgrader-core
UpgradeStatus: Upgraded to precise on 2017-01-12 (0 days ago)
** Affects: update-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade precise
** Summary changed:
- Upgrade from 12.04 to 14.05 was failed
+ Upgrade from 12.04 to 14.04.5 was failed
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https://bugs.launchpad.net/bugs/1656015
Title:
Upgrade from 12.04 to 14.04.5 was failed
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