[Bug 1786640] [NEW] Update manager can't calculate solution

[Eloque]

Public bug reported:

Upgrade from 16.04 to 18.04.
Tried to apply fix for unescaped & 
Dist-upgrade log shows long list of 'broken' packages when attempting to do-dist-upgrade
apt update and apt upgrade work seemingly perfectly.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.4.0-131.157-generic 4.4.134
Uname: Linux 4.4.0-131-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
Date: Sat Aug 11 18:33:46 2018
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-08-11 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2018-08-11T17:00:09.348260

** 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/1786640

Title:
  Update manager can't calculate solution

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

Bug description:
  Upgrade from 16.04 to 18.04.
  Tried to apply fix for unescaped & 
  Dist-upgrade log shows long list of 'broken' packages when attempting to do-dist-upgrade
  apt update and apt upgrade work seemingly perfectly.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-131.157-generic 4.4.134
  Uname: Linux 4.4.0-131-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sat Aug 11 18:33:46 2018
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-11 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2018-08-11T17:00:09.348260

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