upgrade to 16.04 fails

[Jack van Asten]

last part of main.log:

2016-05-11 14:45:15,404 DEBUG examining: 'deb-src http://archive.canonical.com/ubuntu precise partner'
2016-05-11 14:45:15,404 DEBUG examining: 'deb http://ftp.tudelft.nl/archive.ubuntu.com/ wily-proposed main universe multiverse restricted'
2016-05-11 14:45:15,404 DEBUG entry 'deb http://ftp.tudelft.nl/archive.ubuntu.com/ xenial-proposed main universe multiverse restricted' updated to new dist
2016-05-11 14:45:15,405 DEBUG running doUpdate() (showErrors=True)
2016-05-11 14:45:23,393 DEBUG openCache()
2016-05-11 14:45:23,393 DEBUG failed to SystemUnLock() (E:Not locked)
2016-05-11 14:45:27,560 DEBUG /openCache(), new cache size 83357
2016-05-11 14:45:27,561 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubuntu-release-upgrader-core 1:15.10.14.4
ProcVersionSignature: Ubuntu 3.13.0-63.103-generic 3.13.11-ckt25
Uname: Linux 3.13.0-63-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed May 11 14:52:56 2016
InstallationDate: Installed on 2014-05-06 (736 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to wily on 2016-05-11 (0 days ago)
VarLogDistupgradeTermlog:

[Brian Murray (brian-murray)]

It looks like this is a result of the fsl-5.0 packages you have installed which are not a part of the official Ubuntu archive.