[Bug 1787788] [NEW] upgrade xenial --> bionic :cannot compute upgrade

[madtownmike1]

Public bug reported:

I am unaware of any unsupported packages installed that would prevent the upgrade from working. 
I removed as many ppa's as possible, removed any unsupported programs which might be a problem, and fixed the parsing error 'Metadata files have errors: /var/cache/app-info/xmls/fwupd.xml'. I'm at a loss at this point.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.15.0-32.35~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-32-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Sat Aug 18 22:50:27 2018
InstallationDate: Installed on 2015-10-26 (1027 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-08-19 (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/1787788

Title:
  upgrade xenial --> bionic :cannot compute upgrade

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  I am unaware of any unsupported packages installed that would prevent the upgrade from working. 
  I removed as many ppa's as possible, removed any unsupported programs which might be a problem, and fixed the parsing error 'Metadata files have errors: /var/cache/app-info/xmls/fwupd.xml'. I'm at a loss at this point.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.15.0-32.35~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-32-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Sat Aug 18 22:50:27 2018
  InstallationDate: Installed on 2015-10-26 (1027 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-19 (0 days ago)
  VarLogDistupgradeTermlog:

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