Public bug reported:
I am trying to upgrade from 16.04.5 to 18.04.1 and I get the following
error:
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.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.15.0-31.33~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Aug 15 08:57:54 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-03-04 (1990 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-08-15 (0 days ago)
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade xenial
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https://bugs.launchpad.net/bugs/1787098
Title:
update-manager could not calculate the upgrade
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