[Bug 1897905] [NEW] Unable to upgrade to Ubuntu Focal Fossa

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The message from the upgrader was "An unresolvable problem occurred
while calculating the upgrade." and it suggested that I send this bug-
report.

Ubuntu 18.04.5 LTS

apt-cache policy pkgname
N: Unable to locate package pkgname

I wanted to upgrade from 18.04 to 20.04.

The upgrade failed.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.39
ProcVersionSignature: Ubuntu 4.15.0-119.120-generic 4.15.18
Uname: Linux 4.15.0-119-generic x86_64
NonfreeKernelModules: vboxnetadp vboxnetflt vboxdrv
ApportVersion: 2.20.9-0ubuntu7.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Wed Sep 30 15:37:21 2020
InstallationDate: Installed on 2018-10-08 (723 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-09-30 (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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Unable to upgrade to Ubuntu Focal Fossa
https://bugs.launchpad.net/bugs/1897905
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