Public bug reported:
I ran the terminal cmd sudo do-release-upgrade -d and errored out
An unresolvable problem occurred while calculating the upgrade.
This was caused by:
* Upgrading to a pre-release version of Ubuntu
This is most likely a transient problem,
please try again later.
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'.
from logs /var/log/dist-upgrade/main.log
2020-09-25 17:14:27,701 DEBUG updateSourcesList()
2020-09-25 17:14:27,710 DEBUG rewriteSourcesList() with mirror_check
2020-09-25 17:14:27,711 DEBUG ['ubuntu-minimal', 'ubuntu-standard']
2020-09-25 17:14:27,711 DEBUG Checking pkg: ubuntu-minimal
2020-09-25 17:14:27,712 DEBUG BaseMetaPkg 'ubuntu-minimal' has no
candidate.origins
2020-09-25 17:14:27,843 ERROR NoDistroTemplateException raised: Error: could
not find a distribution template for Ubuntu/bionic
Traceback (most recent call last):
File
"/tmp/ubuntu-release-upgrader-l840cs21/DistUpgrade/DistUpgradeController.py",
line 538, in rewriteSourcesList
distro.get_sources(self.sources)
File "/tmp/ubuntu-release-upgrader-l840cs21/DistUpgrade/distro.py", line 93,
in get_sources
(self.id, self.codename))
DistUpgrade.distro.NoDistroTemplateException: Error: could not find a
distribution template for Ubuntu/bionic
2020-09-25 17:14:27,844 DEBUG get_distro().enable_component("main") failed,
overwriting sources.list instead as last resort
2020-09-25 17:14:27,845 DEBUG examining: 'deb
http://archive.canonical.com/ubuntu bionic partner'
2020-09-25 17:14:27,845 DEBUG verifySourcesListEntry: deb
http://archive.canonical.com/ubuntu focal partner
2020-09-25 17:14:27,846 DEBUG url_downloadable:
http://archive.canonical.com/ubuntu/dists/focal/Release
2020-09-25 17:14:27,846 DEBUG s='http' n='archive.canonical.com'
p='/ubuntu/dists/focal/Release' q='' f=''
2020-09-25 17:14:27,924 DEBUG entry 'deb http://archive.canonical.com/ubuntu
focal partner' updated to new dist
2020-09-25 17:14:27,924 DEBUG examining: 'deb http://archive.ubuntu.com/ubuntu
focal main restricted # auto generated by ubuntu-release-upgrader'
2020-09-25 17:14:27,924 DEBUG entry 'deb http://archive.ubuntu.com/ubuntu focal
main restricted # auto generated by ubuntu-release-upgrader' is already set to
new dist
2020-09-25 17:14:27,925 DEBUG examining: 'deb http://archive.ubuntu.com/ubuntu
focal-updates main restricted # auto generated by ubuntu-release-upgrader'
2020-09-25 17:14:27,925 DEBUG entry 'deb http://archive.ubuntu.com/ubuntu
focal-updates main restricted # auto generated by ubuntu-release-upgrader' is
already set to new dist
2020-09-25 17:14:27,925 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu
focal-security main restricted # auto generated by ubuntu-release-upgrader'
2020-09-25 17:14:27,925 DEBUG entry 'deb http://security.ubuntu.com/ubuntu
focal-security main restricted # auto generated by ubuntu-release-upgrader' is
already set to new dist
2020-09-25 17:14:27,927 DEBUG running doUpdate() (showErrors=True)
2020-09-25 17:14:33,447 DEBUG openCache()
2020-09-25 17:14:33,780 DEBUG Comparing 5.3.0-40 with
2020-09-25 17:14:33,781 DEBUG Comparing 5.4.0-42 with 5.3.0-40
2020-09-25 17:14:33,782 DEBUG Comparing 5.4.0-47 with 5.4.0-42
2020-09-25 17:14:33,782 DEBUG Comparing 5.4.0-48 with 5.4.0-47
2020-09-25 17:14:33,830 DEBUG /openCache(), new cache size 10189
2020-09-25 17:14:33,830 DEBUG need_server_mode(): run in 'desktop' mode,
(because of pkg 'ubuntu-desktop')
2020-09-25 17:14:33,831 DEBUG quirks: running PreDistUpgradeCache
2020-09-25 17:14:33,831 DEBUG running Quirks.PreDistUpgradeCache
2020-09-25 17:14:33,831 INFO installing python-is-python2 because
python-minimal was installed
2020-09-25 17:14:33,831 DEBUG Installing 'python-is-python2' (python-minimal
was installed on the system)
2020-09-25 17:14:33,831 INFO removing python-minimal because python-is-python2
is being installed
2020-09-25 17:14:33,831 DEBUG Removing 'python-minimal' (python-is-python2 is
being installed on the system)
2020-09-25 17:14:34,524 ERROR Dist-upgrade failed: 'E:Error,
pkgProblemResolver::Resolve generated breaks, this may be caused by held
packages.'
2020-09-25 17:14:34,528 DEBUG abort called
2020-09-25 17:14:34,529 DEBUG openCache()
2020-09-25 17:14:34,730 DEBUG Comparing 5.3.0-40 with
2020-09-25 17:14:34,731 DEBUG Comparing 5.4.0-42 with 5.3.0-40
2020-09-25 17:14:34,731 DEBUG Comparing 5.4.0-47 with 5.4.0-42
2020-09-25 17:14:34,731 DEBUG Comparing 5.4.0-48 with 5.4.0-47
2020-09-25 17:14:34,747 DEBUG /openCache(), new cache size 2695
I ran all updates and upgrades to ubuntu 18.04
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38 [origin: unknown]
ProcVersionSignature: Ubuntu 5.4.0-42.46~18.04.1-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity:Unity7:ubuntu
Date: Fri Sep 25 17:23:36 2020
InstallationDate: Installed on 2019-08-06 (416 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-09-25 (0 days ago)
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic dist-upgrade third-party-packages
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https://bugs.launchpad.net/bugs/1897348
Title:
Upgrade from ubuntu 18.04 to ubuntu 20.04 error
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