Can’t upgrade from 14.04 to 16.04

[flrtx]

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)

[Brian Murray (brian-murray)]

Please try installing the ubuntu-desktop metapackage and then upgrading.

[flrtx (fltrx)]

Thanks for looking into this issue, Brian.

I installed ubuntu-desktop and retried upgrading to 16.04. It didn't work. The error message is the same. Any other ideas?

[Jouni Mettala (jouni-mettala)]

According to VarLogDistupgradeAptlog.txt You have installed vlc from ppa. Could you uninstall it with ppa-purge?

[Brian Murray (brian-murray)]

On Thu, Apr 18, 2019 at 11:47:47AM -0000, flrtx wrote:
> Thanks for looking into this issue, Brian.
>
> I installed ubuntu-desktop and retried upgrading to 16.04. It didn't
> work. The error message is the same. Any other ideas?

Please add the log file /var/log/dist-upgrade/main.log and
/var/log/dist-upgrade/apt.log or just open a new bug report using
'ubuntu-bug ubuntu-release-upgrader' as that will have all the log file
regarding the upgrade and let me know the new bug number.

--
Brian Murray

[flrtx (fltrx)]

I did that. The new report is Bug #1825564

[Launchpad Janitor (janitor)]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.]