[Bug 1890878] [NEW] Can not upgrade to Ubuntu 20.04 from Ubuntu 18.04

[Ujjwal Biswas]

Public bug reported:

Can not upgrade to 20.04 from 18.04 after checking repository information upgrades stops at calculate changes, saying "Could not calculate the upgrade" then the error message shows
"An unresolvable problem occurred while calculating the upgrade. 

If none of this applies, then please report this bug using the 
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If 
you want to investigate this yourself the log files in 
'/var/log/dist-upgrade' will contain details about the upgrade. 
Specifically, look at 'main.log' and 'apt.log'."

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 5.4.0-42.46~18.04.1-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.16
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sat Aug  8 14:33:33 2020
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-08-08 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2020-08-08T00:22:03.094800

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


** Tags: amd64 apport-bug bionic dist-upgrade

** Summary changed:

- Can not upgrade to Ubuntu 20.04  fro Ubuntu 18.04
+ Can not upgrade to Ubuntu 20.04  from Ubuntu 18.04

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https://bugs.launchpad.net/bugs/1890878

Title:
  Can not upgrade to Ubuntu 20.04  from Ubuntu 18.04

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

Bug description:
  Can not upgrade to 20.04 from 18.04 after checking repository information upgrades stops at calculate changes, saying "Could not calculate the upgrade" then the error message shows
  "An unresolvable problem occurred while calculating the upgrade. 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If 
  you want to investigate this yourself the log files in 
  '/var/log/dist-upgrade' will contain details about the upgrade. 
  Specifically, look at 'main.log' and 'apt.log'."

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 5.4.0-42.46~18.04.1-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.16
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Aug  8 14:33:33 2020
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-08-08 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2020-08-08T00:22:03.094800

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