Public bug reported:
$ cat /var/log/dist-upgrade/main.log
2020-10-07 20:52:52,701 INFO Using config files '['./DistUpgrade.cfg.bionic']'
2020-10-07 20:52:52,701 INFO uname information: 'Linux halx 5.4.0-48-generic
#52~18.04.1-Ubuntu SMP Thu Sep 10 12:50:22 UTC 2020 x86_64'
2020-10-07 20:52:53,193 INFO apt version: '1.6.12ubuntu0.1'
2020-10-07 20:52:53,193 INFO python version: '3.6.9 (default, Jul 17 2020,
12:50:27)
[GCC 8.4.0]'
2020-10-07 20:52:53,198 INFO release-upgrader version '20.04.25' started
2020-10-07 20:52:53,211 INFO locale: 'en_US' 'UTF-8'
2020-10-07 20:52:53,263 INFO screen could not be run
2020-10-07 20:52:53,293 DEBUG Using 'DistUpgradeViewText' view
2020-10-07 20:52:53,338 DEBUG enable dpkg --force-overwrite
2020-10-07 20:52:53,367 DEBUG creating statefile:
'/var/log/dist-upgrade/apt-clone_system_state.tar.gz'
2020-10-07 20:52:56,442 DEBUG lsb-release: 'bionic'
2020-10-07 20:52:56,442 DEBUG _pythonSymlinkCheck run
2020-10-07 20:52:56,443 DEBUG openCache()
2020-10-07 20:52:56,443 DEBUG quirks: running PreCacheOpen
2020-10-07 20:52:56,443 DEBUG running Quirks.PreCacheOpen
2020-10-07 20:52:57,532 DEBUG Comparing 5.4.0-47 with
2020-10-07 20:52:57,532 DEBUG Comparing 5.4.0-48 with 5.4.0-47
2020-10-07 20:52:57,729 DEBUG /openCache(), new cache size 99739
2020-10-07 20:52:57,729 DEBUG need_server_mode(): run in 'desktop' mode,
(because of pkg 'ubuntu-desktop')
2020-10-07 20:52:57,729 DEBUG checkViewDepends()
2020-10-07 20:52:57,730 DEBUG running doUpdate() (showErrors=False)
2020-10-07 20:52:58,698 DEBUG openCache()
2020-10-07 20:52:59,760 DEBUG Comparing 5.4.0-47 with
2020-10-07 20:52:59,760 DEBUG Comparing 5.4.0-48 with 5.4.0-47
2020-10-07 20:52:59,978 DEBUG /openCache(), new cache size 99739
2020-10-07 20:52:59,979 DEBUG doPostInitialUpdate
2020-10-07 20:52:59,979 DEBUG quirks: running focalPostInitialUpdate
2020-10-07 20:52:59,979 DEBUG running Quirks.focalPostInitialUpdate
2020-10-07 20:53:01,714 DEBUG Snap core18 is installed
2020-10-07 20:53:01,911 DEBUG Snap gnome-3-34-1804 is installed
2020-10-07 20:53:01,913 DEBUG Snap gnome-3-34-1804 is not tracking the release
channel
2020-10-07 20:53:02,230 DEBUG Snap gtk-common-themes is installed
2020-10-07 20:53:02,743 DEBUG Snap gnome-3-28-1804 is installed
2020-10-07 20:53:02,743 DEBUG Snap gnome-3-28-1804 is not tracking the release
channel
2020-10-07 20:53:03,052 DEBUG Snap gnome-calculator is installed
2020-10-07 20:53:03,233 DEBUG Snap gnome-characters is installed
2020-10-07 20:53:03,564 DEBUG Snap gnome-logs is installed
2020-10-07 20:53:05,679 DEBUG MetaPkgs: ubuntu-desktop
2020-10-07 20:53:08,387 DEBUG Foreign:
2020-10-07 20:53:08,387 DEBUG Obsolete: gnome-subtitles synology-cloud-station
2020-10-07 20:53:08,387 DEBUG updateSourcesList()
2020-10-07 20:53:08,398 DEBUG rewriteSourcesList() with mirror_check
2020-10-07 20:53:08,398 DEBUG ['ubuntu-minimal', 'ubuntu-standard']
2020-10-07 20:53:08,398 DEBUG Checking pkg: ubuntu-minimal
2020-10-07 20:53:08,400 DEBUG Checking pkg: ubuntu-standard
2020-10-07 20:53:08,401 DEBUG examining: 'deb
http://se.archive.ubuntu.com/ubuntu/ bionic main restricted'
2020-10-07 20:53:08,401 DEBUG verifySourcesListEntry: deb
http://se.archive.ubuntu.com/ubuntu/ focal main restricted
2020-10-07 20:53:08,402 DEBUG url_downloadable:
http://se.archive.ubuntu.com/ubuntu//dists/focal/Release
2020-10-07 20:53:08,402 DEBUG s='http' n='se.archive.ubuntu.com'
p='/ubuntu//dists/focal/Release' q='' f=''
2020-10-07 20:53:08,611 DEBUG entry 'deb http://se.archive.ubuntu.com/ubuntu/
focal main restricted' updated to new dist
2020-10-07 20:53:08,612 DEBUG examining: 'deb
http://se.archive.ubuntu.com/ubuntu/ bionic-updates main restricted'
2020-10-07 20:53:08,612 DEBUG entry 'deb http://se.archive.ubuntu.com/ubuntu/
focal-updates main restricted' updated to new dist
2020-10-07 20:53:08,612 DEBUG examining: 'deb
http://se.archive.ubuntu.com/ubuntu/ bionic universe'
2020-10-07 20:53:08,613 DEBUG entry 'deb http://se.archive.ubuntu.com/ubuntu/
focal universe' updated to new dist
2020-10-07 20:53:08,613 DEBUG examining: 'deb
http://se.archive.ubuntu.com/ubuntu/ bionic-updates universe'
2020-10-07 20:53:08,614 DEBUG entry 'deb http://se.archive.ubuntu.com/ubuntu/
focal-updates universe' updated to new dist
2020-10-07 20:53:08,614 DEBUG examining: 'deb
http://se.archive.ubuntu.com/ubuntu/ bionic multiverse'
2020-10-07 20:53:08,615 DEBUG entry 'deb http://se.archive.ubuntu.com/ubuntu/
focal multiverse' updated to new dist
2020-10-07 20:53:08,615 DEBUG examining: 'deb
http://se.archive.ubuntu.com/ubuntu/ bionic-updates multiverse'
2020-10-07 20:53:08,616 DEBUG entry 'deb http://se.archive.ubuntu.com/ubuntu/
focal-updates multiverse' updated to new dist
2020-10-07 20:53:08,616 DEBUG examining: 'deb
http://se.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe
multiverse'
2020-10-07 20:53:08,617 DEBUG entry 'deb http://se.archive.ubuntu.com/ubuntu/
focal-backports main restricted universe multiverse' updated to new dist
2020-10-07 20:53:08,617 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu
bionic-security main restricted'
2020-10-07 20:53:08,617 DEBUG verifySourcesListEntry: deb
http://security.ubuntu.com/ubuntu focal main restricted
2020-10-07 20:53:08,618 DEBUG url_downloadable:
http://security.ubuntu.com/ubuntu/dists/focal/Release
2020-10-07 20:53:08,618 DEBUG s='http' n='security.ubuntu.com'
p='/ubuntu/dists/focal/Release' q='' f=''
2020-10-07 20:53:08,876 DEBUG entry 'deb http://security.ubuntu.com/ubuntu
focal-security main restricted' updated to new dist
2020-10-07 20:53:08,876 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu
bionic-security universe'
2020-10-07 20:53:08,877 DEBUG entry 'deb http://security.ubuntu.com/ubuntu
focal-security universe' updated to new dist
2020-10-07 20:53:08,877 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu
bionic-security multiverse'
2020-10-07 20:53:08,877 DEBUG entry 'deb http://security.ubuntu.com/ubuntu
focal-security multiverse' updated to new dist
2020-10-07 20:53:08,881 DEBUG running doUpdate() (showErrors=True)
2020-10-07 20:53:44,943 DEBUG openCache()
2020-10-07 20:53:45,735 DEBUG Comparing 5.4.0-47 with
2020-10-07 20:53:45,735 DEBUG Comparing 5.4.0-48 with 5.4.0-47
2020-10-07 20:53:45,877 DEBUG /openCache(), new cache size 66441
2020-10-07 20:53:45,878 DEBUG need_server_mode(): run in 'desktop' mode,
(because of pkg 'ubuntu-desktop')
2020-10-07 20:53:45,878 DEBUG quirks: running PreDistUpgradeCache
2020-10-07 20:53:45,878 DEBUG running Quirks.PreDistUpgradeCache
2020-10-07 20:53:45,878 INFO installing python-is-python2 because
python-minimal was installed
2020-10-07 20:53:45,878 DEBUG Installing 'python-is-python2' (python-minimal
was installed on the system)
2020-10-07 20:53:46,173 ERROR Dist-upgrade failed: 'E:Error,
pkgProblemResolver::Resolve generated breaks, this may be caused by held
packages.'
2020-10-07 20:53:46,174 DEBUG abort called
2020-10-07 20:53:46,175 DEBUG openCache()
2020-10-07 20:53:48,831 DEBUG Comparing 5.4.0-47 with
2020-10-07 20:53:48,831 DEBUG Comparing 5.4.0-48 with 5.4.0-47
2020-10-07 20:53:49,065 DEBUG /openCache(), new cache size 99739
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 5.4.0-48.52~18.04.1-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 7 21:12:45 2020
InstallationDate: Installed on 2019-07-12 (453 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-10-07 (0 days ago)
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic dist-upgrade
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https://bugs.launchpad.net/bugs/1898923
Title:
Upgrading from 2018.04 to to 2020.04 fails. Tried disabling repos,
uninstalling things etc.
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