Public bug reported:
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:
** 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/1784157
Title:
'sudo update-manager -d' failed
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