[Bug 1904643] [NEW] Unable to upgrade, non-informative error

[Hans]

Public bug reported:

In attempting to upgrade, I get a notice that "An unresolvable problem
occurred while calculating the upgrade." Followed by a blank space,
followed by a notice that "if none of this applies..." saying check the
logs. I am guessing something was supposed to be in that blank space.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.40
ProcVersionSignature: Ubuntu 4.15.0-124.127-generic 4.15.18
Uname: Linux 4.15.0-124-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.20
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity:Unity7:ubuntu
Date: Tue Nov 17 18:14:40 2020
InstallationDate: Installed on 2016-02-10 (1742 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-11-18 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic dist-upgrade third-party-packages

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https://bugs.launchpad.net/bugs/1904643

Title:
  Unable to upgrade, non-informative error

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

Bug description:
  In attempting to upgrade, I get a notice that "An unresolvable problem
  occurred while calculating the upgrade." Followed by a blank space,
  followed by a notice that "if none of this applies..." saying check
  the logs. I am guessing something was supposed to be in that blank
  space.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.40
  ProcVersionSignature: Ubuntu 4.15.0-124.127-generic 4.15.18
  Uname: Linux 4.15.0-124-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.20
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity:Unity7:ubuntu
  Date: Tue Nov 17 18:14:40 2020
  InstallationDate: Installed on 2016-02-10 (1742 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-11-18 (0 days ago)
  VarLogDistupgradeTermlog:

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