Comment 0 for bug 1924604

This is because universe was not enabled on the system being upgraded.

ProblemType: Crash
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.31
ProcVersionSignature: Ubuntu 5.4.0-71.79~18.04.1-generic 5.4.101
Uname: Linux 5.4.0-71-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
CrashDB: ubuntu
Date: Thu Apr 15 10:59:53 2021
ExecutablePath: /usr/bin/do-release-upgrade
ExecutableTimestamp: 1606763386
InstallationDate: Installed on 2021-04-13 (1 days ago)
InstallationMedia: Ubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1)
InterpreterPath: /usr/bin/python3.6
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 -s ./focal --frontend DistUpgradeViewText
ProcCwd: /tmp/ubuntu-release-upgrader-e397n4sn
ProcEnviron:
 TERM=screen
 SHELL=/bin/bash
 LANG=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 PATH=(custom, no user)
Python3Details: /usr/bin/python3.6, Python 3.6.9, python3-minimal, 3.6.7-1~18.04
PythonArgs: ['/usr/bin/do-release-upgrade', '--frontend', 'DistUpgradeViewText']
PythonDetails: /usr/bin/python2.7, Python 2.7.17, python-minimal, 2.7.15~rc1-1
SourcePackage: ubuntu-release-upgrader
Title: do-release-upgrade crashed with KeyError in __getitem__(): "The cache has no package named 'python-is-python2'"
UpgradeStatus: Upgraded to bionic on 2021-04-15 (0 days ago)