Public bug reported:
I can't do upgrade to 18.04, i don't know why, still have this error.
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
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.15.0-35.38~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-35-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
Date: Thu Sep 27 13:45:54 2018
InstallationDate: Installed on 2013-12-19 (1743 days ago)
InstallationMedia: Ubuntu-Server 13.10 "Saucy Salamander" - Release amd64
(20131016)
PackageArchitecture: all
ProcEnviron:
LANGUAGE=en_US:en
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-09-27 (0 days ago)
** 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/1794736
Title:
Cannot upgrade from Ubuntu 16.04 to 18.04
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