** Description changed:
- This is because python-minimal was installed and universe was not
- enabled on the system being upgraded.
+ [Impact]
+ Users with universe not enabled and python2 packages installed are unable to
upgrade from Ubuntu 18.04 to Ubuntu 20.04.
+
+ [Test Case]
+ -----------
+ On an Ubuntu 18.04 system with universe and multiverse disabled
+ 1) apt-get install duplicity (it depends on python2.7)
+ 2) run do-release-upgrade
+
+ Observe the upgrader hang at Calculating the changes (in text mode) kill
+ it and observe a Traceback in /var/log/dist-upgrade/main.log.
+
+ ...
+ File "/usr/lib/python3/dist-packages/apt/cache.py", line 303, in __getitem__
+ raise KeyError('The cache has no package named %r' % key)
+ KeyError: "The cache has no package named 'python-is-python2'"
+
+ With the version of the release-upgrader from -proposed (do-release-
+ upgrade -p) you'll instead receive a message regarding universe not
+ being enabled and the need to either remove python2 packages or enable
+ universe.
+
+ [Original Description]
+ This is because python-minimal was installed and universe was not enabled on
the system being upgraded.
Error Tracker buckets:
https://errors.ubuntu.com/problem/f92900f3c057db7600d88857e7c05434b69d2496
https://errors.ubuntu.com/problem/23e6edb38993cb74331d30beeadccdfffe1d557a
ProblemType: CrashDistroRelease: 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~rc1-1SourcePackage: 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)
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https://bugs.launchpad.net/bugs/1924604
Title:
do-release-upgrade crashed with KeyError in __getitem__(): "The cache
has no package named 'python-is-python2'"
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