trying to update 15.10 to 16.04 LTS I get the following:
[miel@miel-W740SU:~]$ sudo do-release-upgrade
[sudo] password for miel:
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [198 B]
Get:2 Upgrade tool [1265 kB]
Fetched 1265 kB in 0s (0 B/s)
authenticate 'xenial.tar.gz' against 'xenial.tar.gz.gpg'
extracting 'xenial.tar.gz'
Reading cache
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Ign http://dl.google.com stable InRelease
Hit http://archive.ubuntu.com wily InRelease
Ign http://dl.google.com stable InRelease
Get:1 http://archive.ubuntu.com wily-security InRelease [65,9 kB]
Hit http://dl.google.com stable Release.gpg
Ign http://ppa.launchpad.net wily InRelease
Hit http://dl.google.com stable Release.gpg
Hit http://archive.canonical.com wily InRelease
Hit http://dl.google.com stable Release
Hit http://dl.google.com stable Release
Get:2 http://archive.ubuntu.com wily-updates InRelease [65,9 kB]
Hit http://ppa.launchpad.net wily InRelease
Hit http://archive.ubuntu.com wily-backports InRelease
Err http://dl.google.com stable/main Translation-en
Hit http://ppa.launchpad.net wily InRelease
Get:3 http://ppa.launchpad.net wily InRelease [15,5 kB]
Err http://dl.google.com stable/main Translation-en
Hit http://dl.google.com stable/main amd64 Packages
Hit http://archive.canonical.com wily/partner amd64 Packages
Err http://dl.google.com stable/main Translation-en
Hit http://dl.google.com stable/main amd64 Packages
Ign http://ppa.launchpad.net wily InRelease
Hit http://dl.google.com stable/main i386 Packages
Hit http://archive.canonical.com wily/partner i386 Packages
Err http://dl.google.com stable/main Translation-en
Err http://dl.google.com stable/main Translation-en
Hit http://ppa.launchpad.net wily InRelease
Hit http://archive.canonical.com wily/partner Translation-en
Err http://dl.google.com stable/main Translation-en
Err http://dl.google.com stable/main Translation-en
Ign http://ppa.launchpad.net wily Release.gpg
Err http://dl.google.com stable/main Translation-en
Ign http://dl.google.com stable/main Translation-en
Ign http://dl.google.com stable/main Translation-en
Get:4 http://archive.ubuntu.com wily-security/main Sources [47,4 kB]
Get:5 http://archive.ubuntu.com wily-security/restricted Sources [2854 B]
Get:6 http://archive.ubuntu.com wily-security/universe Sources [11,8 kB]
Get:7 http://archive.ubuntu.com wily-security/multiverse Sources [2782 B]
Get:8 http://archive.ubuntu.com wily-security/main amd64 Packages [151 kB]
Get:9 http://archive.ubuntu.com wily-security/restricted amd64 Packages [10,9 kB]
Get:10 http://ppa.launchpad.net wily/main amd64 Packages [19,1 kB]
Get:11 http://archive.ubuntu.com wily-security/universe amd64 Packages [52,2 kB]
Get:12 https://launchpad.net wily InRelease [10,0 kB]
Ign https://launchpad.net wily InRelease
Get:13 http://archive.ubuntu.com wily-security/multiverse amd64 Packages [6253 B]
Get:14 http://archive.ubuntu.com wily-security/main i386 Packages [148 kB]
Get:15 http://ppa.launchpad.net wily/main i386 Packages [19,2 kB]
Get:16 http://archive.ubuntu.com wily-security/restricted i386 Packages [10,8 kB]
Get:17 http://archive.ubuntu.com wily-security/universe i386 Packages [52,2 kB]
Get:18 http://ppa.launchpad.net wily/main Translation-en [11,6 kB]
Get:19 http://archive.ubuntu.com wily-security/multiverse i386 Packages [6430 B]
Get:20 http://archive.ubuntu.com wily-security/main Translation-en [73,4 kB]
Ign http://ppa.launchpad.net wily Release.gpg
Get:21 http://archive.ubuntu.com wily-security/multiverse Translation-en [2806 B]
Get:22 http://archive.ubuntu.com wily-security/restricted Translation-en [2666 B]
Get:23 http://archive.ubuntu.com wily-security/universe Translation-en [33,8 kB]
Get:24 http://archive.ubuntu.com wily-updates/main Sources [76,8 kB]
Get:25 http://archive.ubuntu.com wily-updates/restricted Sources [3741 B]
Get:26 http://archive.ubuntu.com wily-updates/universe Sources [23,9 kB]
Get:27 https://launchpad.net wily Release.gpg [10,0 kB]
Ign https://launchpad.net wily Release.gpg
Get:28 http://archive.ubuntu.com wily-updates/multiverse Sources [3203 B]
Get:29 http://archive.ubuntu.com wily-updates/main amd64 Packages [215 kB]
Ign http://ppa.launchpad.net wily Release
Get:30 http://archive.ubuntu.com wily-updates/restricted amd64 Packages [13,3 kB]
Get:31 http://archive.ubuntu.com wily-updates/universe amd64 Packages [95,3 kB]
Hit http://ppa.launchpad.net wily/main amd64 Packages
Get:32 http://archive.ubuntu.com wily-updates/multiverse amd64 Packages [6253 B]
Hit http://ppa.launchpad.net wily/main i386 Packages
Get:33 http://archive.ubuntu.com wily-updates/main i386 Packages [211 kB]
Hit http://ppa.launchpad.net wily/main Translation-en
Get:34 http://archive.ubuntu.com wily-updates/restricted i386 Packages [13,4 kB]
Get:35 http://archive.ubuntu.com wily-updates/universe i386 Packages [92,7 kB]
Hit http://ppa.launchpad.net wily/main amd64 Packages
Get:36 http://archive.ubuntu.com wily-updates/multiverse i386 Packages [6677 B]
Get:37 http://archive.ubuntu.com wily-updates/main Translation-en [99,0 kB]
Hit http://ppa.launchpad.net wily/main i386 Packages
Get:38 http://archive.ubuntu.com wily-updates/multiverse Translation-en [3156 B]
Hit http://ppa.launchpad.net wily/main Translation-en
Get:39 http://archive.ubuntu.com wily-updates/restricted Translation-en [3024 B]
Ign http://ppa.launchpad.net wily Release
Get:40 http://archive.ubuntu.com wily-updates/universe Translation-en [54,5 kB]
Hit http://ppa.launchpad.net wily/main amd64 Packages
Get:41 https://launchpad.net wily Release [10,0 kB]
Ign https://launchpad.net wily Release
Hit http://archive.ubuntu.com wily-backports/restricted Sources
Hit http://ppa.launchpad.net wily/main i386 Packages
Hit http://archive.ubuntu.com wily-backports/multiverse Sources
Hit http://ppa.launchpad.net wily/main Translation-en
Hit http://archive.ubuntu.com wily-backports/restricted amd64 Packages
Err http://ppa.launchpad.net wily/main amd64 Packages
Hit http://archive.ubuntu.com wily-backports/multiverse amd64 Packages
Err http://ppa.launchpad.net wily/main i386 Packages
Hit http://archive.ubuntu.com wily-backports/restricted i386 Packages
Err http://ppa.launchpad.net wily/main Translation-en
Hit http://archive.ubuntu.com wily-backports/multiverse i386 Packages
Hit http://archive.ubuntu.com wily-backports/multiverse Translation-en
Err http://ppa.launchpad.net wily/main amd64 Packages
Hit http://archive.ubuntu.com wily-backports/restricted Translation-en
Err http://ppa.launchpad.net wily/main i386 Packages
Hit http://archive.ubuntu.com wily/main Sources
Err http://ppa.launchpad.net wily/main Translation-en
Hit http://archive.ubuntu.com wily/restricted Sources
Hit http://archive.ubuntu.com wily/universe Sources
Hit http://archive.ubuntu.com wily/multiverse Sources
Hit http://archive.ubuntu.com wily/main amd64 Packages
Hit http://archive.ubuntu.com wily/restricted amd64 Packages
Err http://ppa.launchpad.net wily/main amd64 Packages
Get:42 https://launchpad.net wily/main amd64 Packages [10,0 kB]
Hit http://archive.ubuntu.com wily/universe amd64 Packages
Err https://launchpad.net wily/main amd64 Packages
Hit http://archive.ubuntu.com wily/multiverse amd64 Packages
Err http://ppa.launchpad.net wily/main i386 Packages
Hit http://archive.ubuntu.com wily/main i386 Packages
Hit http://archive.ubuntu.com wily/restricted i386 Packages
Hit http://archive.ubuntu.com wily/universe i386 Packages
Err http://ppa.launchpad.net wily/main Translation-en
Hit http://archive.ubuntu.com wily/multiverse i386 Packages
Hit http://archive.ubuntu.com wily/main Translation-en
Err http://ppa.launchpad.net wily/main amd64 Packages
Hit http://archive.ubuntu.com wily/multiverse Translation-en
Hit http://archive.ubuntu.com wily/restricted Translation-en
Err http://ppa.launchpad.net wily/main i386 Packages
Hit http://archive.ubuntu.com wily/universe Translation-en
Hit http://archive.ubuntu.com wily-backports/main Sources
Hit http://archive.ubuntu.com wily-backports/universe Sources
Err http://ppa.launchpad.net wily/main Translation-en
Hit http://archive.ubuntu.com wily-backports/main amd64 Packages
Err http://ppa.launchpad.net wily/main amd64 Packages
Err http://ppa.launchpad.net wily/main i386 Packages
Hit http://archive.ubuntu.com wily-backports/universe amd64 Packages
Hit http://archive.ubuntu.com wily-backports/main i386 Packages
Err http://ppa.launchpad.net wily/main Translation-en
Hit http://archive.ubuntu.com wily-backports/universe i386 Packages
Hit http://archive.ubuntu.com wily-backports/main Translation-en
Err http://ppa.launchpad.net wily/main amd64 Packages
Hit http://archive.ubuntu.com wily-backports/universe Translation-en
Get:43 https://launchpad.net wily/main i386 Packages [10,0 kB]
Err https://launchpad.net wily/main i386 Packages
Err http://ppa.launchpad.net wily/main i386 Packages
Err http://ppa.launchpad.net wily/main Translation-en
Err http://ppa.launchpad.net wily/main amd64 Packages
Err http://ppa.launchpad.net wily/main i386 Packages
Err http://ppa.launchpad.net wily/main Translation-en
Err http://ppa.launchpad.net wily/main amd64 Packages
Err http://ppa.launchpad.net wily/main i386 Packages
Err http://ppa.launchpad.net wily/main Translation-en
Err http://ppa.launchpad.net wily/main amd64 Packages
404 Not Found
Err http://ppa.launchpad.net wily/main i386 Packages
404 Not Found
Ign http://ppa.launchpad.net wily/main Translation-en
Err http://ppa.launchpad.net wily/main amd64 Packages
404 Not Found
Err http://ppa.launchpad.net wily/main i386 Packages
404 Not Found
Ign http://ppa.launchpad.net wily/main Translation-en
Get:44 https://launchpad.net wily/main Translation-en [10,0 kB]
Err https://launchpad.net wily/main Translation-en
Get:45 https://launchpad.net wily/main amd64 Packages [10,0 kB]
Err https://launchpad.net wily/main amd64 Packages
Get:46 https://launchpad.net wily/main i386 Packages [10,0 kB]
Err https://launchpad.net wily/main i386 Packages
Get:47 https://launchpad.net wily/main Translation-en [10,0 kB]
Err https://launchpad.net wily/main Translation-en
Get:48 https://launchpad.net wily/main amd64 Packages [10,0 kB]
Err https://launchpad.net wily/main amd64 Packages
Get:49 https://launchpad.net wily/main i386 Packages [10,0 kB]
Err https://launchpad.net wily/main i386 Packages
Get:50 https://launchpad.net wily/main Translation-en [10,0 kB]
Err https://launchpad.net wily/main Translation-en
Get:51 https://launchpad.net wily/main amd64 Packages [10,0 kB]
Err https://launchpad.net wily/main amd64 Packages
Get:52 https://launchpad.net wily/main i386 Packages [10,0 kB]
Err https://launchpad.net wily/main i386 Packages
Get:53 https://launchpad.net wily/main Translation-en [10,0 kB]
Err https://launchpad.net wily/main Translation-en
Get:54 https://launchpad.net wily/main amd64 Packages [10,0 kB]
Err https://launchpad.net wily/main amd64 Packages
HttpError404
Get:55 https://launchpad.net wily/main i386 Packages [10,0 kB]
Err https://launchpad.net wily/main i386 Packages
HttpError404
Get:56 https://launchpad.net wily/main Translation-en [10,0 kB]
Ign https://launchpad.net wily/main Translation-en
Fetched 1734 kB in 6s (26,4 MB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
Updating repository information
Third party sources disabled
Some third party entries in your sources.list were disabled. You can
re-enable them after the upgrade with the 'software-properties' tool
or your package manager.
To continue please press [ENTER]
Hit http://archive.ubuntu.com xenial InRelease
Get:1 http://archive.ubuntu.com xenial-security InRelease [92,2 kB]
Hit http://archive.canonical.com xenial InRelease
Get:2 http://archive.ubuntu.com xenial-updates InRelease [93,3 kB]
Hit http://archive.ubuntu.com xenial-backports InRelease
Hit http://archive.canonical.com xenial/partner amd64 Packages
Hit http://archive.canonical.com xenial/partner i386 Packages
Hit http://archive.canonical.com xenial/partner Translation-en
Get:3 http://archive.ubuntu.com xenial-security/main Sources [5760 B]
Get:4 http://archive.ubuntu.com xenial-security/restricted Sources [64 B]
Get:5 http://archive.ubuntu.com xenial-security/universe Sources [1532 B]
Get:6 http://archive.ubuntu.com xenial-security/multiverse Sources [64 B]
Get:7 http://archive.ubuntu.com xenial-security/main amd64 Packages [26,6 kB]
Get:8 http://archive.ubuntu.com xenial-security/restricted amd64 Packages [64 B]
Get:9 http://archive.ubuntu.com xenial-security/universe amd64 Packages [4628 B]
Get:10 http://archive.ubuntu.com xenial-security/multiverse amd64 Packages [64 B]
Get:11 http://archive.ubuntu.com xenial-security/main i386 Packages [26,6 kB]
Get:12 http://archive.ubuntu.com xenial-security/restricted i386 Packages [64 B]
Get:13 http://archive.ubuntu.com xenial-security/universe i386 Packages [4620 B]
Get:14 http://archive.ubuntu.com xenial-security/multiverse i386 Packages [64 B]
Get:15 http://archive.ubuntu.com xenial-security/main Translation-en [8780 B]
Get:16 http://archive.ubuntu.com xenial-security/multiverse Translation-en [64 B]
Get:17 http://archive.ubuntu.com xenial-security/restricted Translation-en [64 B]
Get:18 http://archive.ubuntu.com xenial-security/universe Translation-en [2756 B]
Get:19 http://archive.ubuntu.com xenial-updates/main Sources [10,9 kB]
Get:20 http://archive.ubuntu.com xenial-updates/restricted Sources [64 B]
Get:21 http://archive.ubuntu.com xenial-updates/universe Sources [1532 B]
Get:22 http://archive.ubuntu.com xenial-updates/multiverse Sources [64 B]
Get:23 http://archive.ubuntu.com xenial-updates/main amd64 Packages [35,7 kB]
Get:24 http://archive.ubuntu.com xenial-updates/restricted amd64 Packages [64 B]
Get:25 http://archive.ubuntu.com xenial-updates/universe amd64 Packages [9012 B]
Get:26 http://archive.ubuntu.com xenial-updates/multiverse amd64 Packages [64 B]
Get:27 http://archive.ubuntu.com xenial-updates/main i386 Packages [35,7 kB]
Get:28 http://archive.ubuntu.com xenial-updates/restricted i386 Packages [64 B]
Get:29 http://archive.ubuntu.com xenial-updates/universe i386 Packages [9016 B]
Get:30 http://archive.ubuntu.com xenial-updates/multiverse i386 Packages [64 B]
Get:31 http://archive.ubuntu.com xenial-updates/main Translation-en [13,6 kB]
Get:32 http://archive.ubuntu.com xenial-updates/multiverse Translation-en [64 B]
Get:33 http://archive.ubuntu.com xenial-updates/restricted Translation-en [64 B]
Get:34 http://archive.ubuntu.com xenial-updates/universe Translation-en [5980 B]
Hit http://archive.ubuntu.com xenial-backports/main Sources
Hit http://archive.ubuntu.com xenial-backports/restricted Sources
Hit http://archive.ubuntu.com xenial-backports/universe Sources
Hit http://archive.ubuntu.com xenial-backports/multiverse Sources
Hit http://archive.ubuntu.com xenial-backports/main amd64 Packages
Hit http://archive.ubuntu.com xenial-backports/restricted amd64 Packages
Hit http://archive.ubuntu.com xenial-backports/universe amd64 Packages
Hit http://archive.ubuntu.com xenial-backports/multiverse amd64 Packages
Hit http://archive.ubuntu.com xenial-backports/main i386 Packages
Hit http://archive.ubuntu.com xenial-backports/restricted i386 Packages
Hit http://archive.ubuntu.com xenial-backports/universe i386 Packages
Hit http://archive.ubuntu.com xenial-backports/multiverse i386 Packages
Hit http://archive.ubuntu.com xenial-backports/main Translation-en
Hit http://archive.ubuntu.com xenial-backports/multiverse Translation-en
Hit http://archive.ubuntu.com xenial-backports/restricted Translation-en
Hit http://archive.ubuntu.com xenial-backports/universe Translation-en
Hit http://archive.ubuntu.com xenial/main Sources
Hit http://archive.ubuntu.com xenial/restricted Sources
Hit http://archive.ubuntu.com xenial/universe Sources
Hit http://archive.ubuntu.com xenial/multiverse Sources
Hit http://archive.ubuntu.com xenial/main amd64 Packages
Hit http://archive.ubuntu.com xenial/restricted amd64 Packages
Hit http://archive.ubuntu.com xenial/universe amd64 Packages
Hit http://archive.ubuntu.com xenial/multiverse amd64 Packages
Hit http://archive.ubuntu.com xenial/main i386 Packages
Hit http://archive.ubuntu.com xenial/restricted i386 Packages
Hit http://archive.ubuntu.com xenial/universe i386 Packages
Hit http://archive.ubuntu.com xenial/multiverse i386 Packages
Hit http://archive.ubuntu.com xenial/main Translation-en
Hit http://archive.ubuntu.com xenial/multiverse Translation-en
Hit http://archive.ubuntu.com xenial/restricted Translation-en
Hit http://archive.ubuntu.com xenial/universe Translation-en
Fetched 389 kB in 0s (0 B/s)
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating the changes
Calculating the changes
Could not calculate the upgrade
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.
Restoring original system state
Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubuntu-release-upgrader-core 1:15.10.14.4
ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
Uname: Linux 4.2.0-35-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Tue May 3 10:55:28 2016
InstallationDate: Installed on 2015-04-24 (374 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to wily on 2016-05-03 (0 days ago)
You seem to have installed the cinnamon package on Ubuntu 13.10. Unfortunately, that package is not available yet for 14.04. To upgrade to Ubuntu 14.04 LTS you'll need to either wait for a fix for cinnamon to be available or uninstall the package and then upgrade.
[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]