'sudo update-manager -d' failed

[Himanshu Jha]

I planned to update Ubuntu 16.04.5 LTS to Ubuntu 18.04 LTS through "sudo update-manager -d" but it prompted with:

Could not calculate upgrade
...
..

I followed and removed all PPAs and various packages installed but still unable to upgrade!

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.4.0-131.157-generic 4.4.134
Uname: Linux 4.4.0-131-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sat Jul 28 21:53:52 2018
InstallationDate: Installed on 2016-12-30 (574 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-07-28 (0 days ago)
VarLogDistupgradeTermlog:

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Antonello (antonelloventurino)]

I removed some broken package, founded from:

cat /var/log/dist-upgrade/apt.log | grep Broken

this fix the issue