Public bug reported:
It fails with possible reasons being the following:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unnofficial software packages not provided by Ubuntu.
There are additional software packages not provided by ubuntu that are
installed on the system, but they have not blocked updates in the past.
Packages like Keepass, Dropbox, Crashplan,
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
Date: Thu Aug 16 17:42:24 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-04-24 (1210 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
PackageArchitecture: all
ProcEnviron:
LANGUAGE=en_US
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-08-16 (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/1787486
Title:
Failure upgrading to 18.04 from 16.04.
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