[Bug 1872384] [NEW] Cant upgrade to 18 LTS from 16

[Chow Jiun Fatt]

Public bug reported:

Distribution upgrade via software updater. But it broke at stage
'Setting new software channels' with error 'Could not calculate the
upgrade'.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.29
ProcVersionSignature: Ubuntu 4.15.0-96.97~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-96-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.23
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Mon Apr 13 10:30:21 2020
InstallationDate: Installed on 2020-01-31 (72 days ago)
InstallationMedia: Ubuntu 16.04.6 LTS "Xenial Xerus" - Release amd64 (20190227)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2020-04-13 (0 days ago)
VarLogDistupgradeTermlog:

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


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

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https://bugs.launchpad.net/bugs/1872384

Title:
  Cant upgrade to 18 LTS from 16

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

Bug description:
  Distribution upgrade via software updater. But it broke at stage
  'Setting new software channels' with error 'Could not calculate the
  upgrade'.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.29
  ProcVersionSignature: Ubuntu 4.15.0-96.97~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-96-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Mon Apr 13 10:30:21 2020
  InstallationDate: Installed on 2020-01-31 (72 days ago)
  InstallationMedia: Ubuntu 16.04.6 LTS "Xenial Xerus" - Release amd64 (20190227)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2020-04-13 (0 days ago)
  VarLogDistupgradeTermlog:

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