Public bug reported:

The message I get is (I am translating from Spanish):

"It is not possible to calculate the upgrade. There has been a problem while 
calculating the upgrade. This could be caused by:
- Upgrading to an Ubuntu version not released yet.
- Being running the current version of Ubuntu, not released yet.
- Non-official software packages not provided by Ubuntu.
If none of this applies, inform of this error using the command "ubuntu-bug 
ubuntu-release-upgrader-core" from a terminal"

The 2 first options do not apply to my case. And to avoid the 3rd
option, I have uninstalled all of the non-official packages that I had
(dropbox, owncloud, chrome, spotify and virtualbox), and disabled the
corresponding sources in /etc/apt/sources.list.d/, without success.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: ubuntu-release-upgrader-core 1:17.04.9
ProcVersionSignature: Ubuntu 4.10.0-38.42-generic 4.10.17
Uname: Linux 4.10.0-38-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
ApportVersion: 2.20.4-0ubuntu4.5
Architecture: amd64
CrashDB: ubuntu
Date: Tue Oct 31 11:10:41 2017
InstallationDate: Installed on 2012-01-23 (2107 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to zesty on 2017-10-31 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade third-party-packages zesty

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https://bugs.launchpad.net/bugs/1728882

Title:
  I can't upgrade to 17.10 from 17.04

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