Public bug reported:

I have disabled all the repositories in settings, only Ubuntu official repo is 
enabled
Checking the output of "ubuntu-support-status" gives me about 270 unsupported 
packages, most of them are "ros-kinetic-*"

How can I recognize which packet makes troubles?

I can by every probe to upgrade the message:
Could not calculate the upgrade

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.15.0-33.36~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-33-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Sep  5 10:40:07 2018
InstallationDate: Installed on 2017-04-09 (513 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-09-05 (0 days ago)
VarLogDistupgradeTermlog:

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


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

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https://bugs.launchpad.net/bugs/1790820

Title:
  i can not upgrade from 16.04 to 18.04.01

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