Unable to upgrade from Ubuntu 12.04 to 14.04

[Carsten Agger]

Update-manager stops and informs me that something unspecified goes wrong.

Apparently, this is about package conflicts which affects a lot of Python packages.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager (not installed)
ProcVersionSignature: Ubuntu 3.13.0-98.145~precise1-generic 3.13.11-ckt39
Uname: Linux 3.13.0-98-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.15
Architecture: amd64
Date: Thu Feb 15 15:42:21 2018
InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 (20120424.1)
MarkForUpload: True
ProcEnviron:
 TERM=screen
 PATH=(custom, no user)
 LANG=da_DK.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
Symptom: ubuntu-release-upgrader-core
UpgradeStatus: Upgraded to precise on 2018-02-15 (0 days ago)

[Gustavo Silva (gsilvapt)]

This seems more close to you having held broken packages. Can you run dpkg --configure -a and apt-get install -f to see if that fixes it?

[Carsten Agger (agger)]

Hi Gustavo,

I just did that. It doesn't fix it. In fact, it does nothing, reflecting the fact that the 12.04 system is already fully upgraded.

[Carsten Agger (agger)]

To be precise:

agger@dsntest:~$ sudo dpkg --configure -a
agger@dsntest:~$ sudo apt-get install -f
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.