Public bug reported:
Upgrade from 16.04-LTS to 18.04-LTS fails without sufficient
error/alerting to resolve.
Possible issue is third party or legacy software but nothing is
identified.
lsb_release -rd
Description: Ubuntu 16.04.5 LTS
Release: 16.04
Command Use:
do-release-upgrade
Expected: upgrade to commence
Actual: upgrade exits with error
Could not determine 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.
Issue: No detail given of what is causing the issue.
existing and future version are not pre-release
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.4.0-133.159-generic 4.4.134
Uname: Linux 4.4.0-133-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sun Aug 26 17:14:50 2018
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-08-26 (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/1789111
Title:
LTS Distro upgrde fails.
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