Public bug reported:
I am unable to start the upgrade process from 14.04 to 16.04.
"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."
I have never used a pre-release of Ubuntu but I may have installed
packages not provided by Ubuntu. I've got some PPAs activated, mainly to
get a more recent version of Ardour and Jack.
How can I resolve this problem and upgrade to the next release? Is there
a way around installing from scratch?
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.10
ProcVersionSignature: Ubuntu 3.13.0-168.218-generic 3.13.11-ckt39
Uname: Linux 3.13.0-168-generic i686
NonfreeKernelModules: wl
ApportVersion: 2.14.1-0ubuntu3.29
Architecture: i386
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sun Apr 14 09:00:15 2019
InstallationDate: Installed on 2012-05-19 (2520 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2019-04-14 (0 days ago)
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug dist-upgrade i386 trusty
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https://bugs.launchpad.net/bugs/1824680
Title:
Can’t upgrade from 14.04 to 16.04
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