Crash during update from ubuntu 18 to 20

[Roland Margelidon]

During the second step of upgrade named in french "Configuration des nouveaux dépôts logiciels", meaning config of new source lists repositories for softwares. I get this message asking me to check ppa-purge and contact the support :

"Impossible d'évaluer la mise à niveau

Un problème insoluble est survenu lors du calcul de la mise à niveau.

 Cela a probablement été causé par :
 * des paquets logiciels non officiels qui ne proviennent pas d’Ubuntu.
Veuillez utiliser la commande « ppa-purge » du paquet
« ppa-purge » afin de supprimer les paquets d’un
dépôt PPA Launchpad, puis essayez de relancer la mise à niveau.

Si rien de tout cela ne s'applique, signalez ce bogue à l'aide de la commande « ubuntu-bug ubuntu-release-upgrader-core » dans un terminal. Si vous souhaitez analyser le problème par vous-même, les fichiers journaux contenus dans le répertoire « /var/log/dist-upgrade » contiennent les informations sur la mise à niveau. Plus précisément, veuillez consulter les journaux « main.log » et « apt.log »."

I checked the log and I found this :
"2021-08-25 15:47:03,772 INFO Using config files '['./DistUpgrade.cfg.bionic', '/etc/update-manager/release-upgrades.d/ubuntu-advantage-upgrades.cfg', '/etc/update-manager/release-upgrades.d/opera-stable.cfg']'
2021-08-25 15:47:03,772 INFO uname information: 'Linux roland-GE60-2QE 4.15.0-154-generic #161-Ubuntu SMP Fri Jul 30 13:04:17 UTC 2021 x86_64'
2021-08-25 15:47:04,188 INFO apt version: '1.6.14'
2021-08-25 15:47:04,189 INFO python version: '3.6.9 (default, Jan 26 2021, 15:33:00)
[GCC 8.4.0]'
2021-08-25 15:47:04,192 INFO release-upgrader version '20.04.36' started
2021-08-25 15:47:04,243 INFO locale: 'fr_FR' 'UTF-8'
2021-08-25 15:47:04,404 DEBUG Using 'DistUpgradeViewGtk3' view
2021-08-25 15:47:04,442 DEBUG enable dpkg --force-overwrite
2021-08-25 15:47:04,456 DEBUG creating statefile: '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'
2021-08-25 15:47:09,512 DEBUG lsb-release: 'bionic'
2021-08-25 15:47:09,513 DEBUG _pythonSymlinkCheck run
2021-08-25 15:47:09,514 DEBUG openCache()
2021-08-25 15:47:09,514 DEBUG quirks: running PreCacheOpen
2021-08-25 15:47:09,514 DEBUG running Quirks.PreCacheOpen
2021-08-25 15:47:10,547 DEBUG Comparing 4.15.0-153 with
2021-08-25 15:47:10,548 DEBUG Comparing 4.15.0-154 with 4.15.0-153
2021-08-25 15:47:10,798 DEBUG /openCache(), new cache size 105055
2021-08-25 15:47:10,799 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')
2021-08-25 15:47:10,799 DEBUG checkViewDepends()
2021-08-25 15:47:10,803 DEBUG running doUpdate() (showErrors=False)
2021-08-25 15:47:14,609 DEBUG openCache()
2021-08-25 15:47:15,650 DEBUG Comparing 4.15.0-153 with
2021-08-25 15:47:15,650 DEBUG Comparing 4.15.0-154 with 4.15.0-153
2021-08-25 15:47:15,907 DEBUG /openCache(), new cache size 105055
2021-08-25 15:47:15,908 DEBUG doPostInitialUpdate
2021-08-25 15:47:15,908 DEBUG quirks: running focalPostInitialUpdate
2021-08-25 15:47:15,908 DEBUG running Quirks.focalPostInitialUpdate
2021-08-25 15:47:18,820 WARNING error reading deb2snap.json file (Expected a string or a pair of strings)
2021-08-25 15:47:19,579 DEBUG Snap core18 is installed
2021-08-25 15:47:21,407 DEBUG Snap gtk-common-themes is installed
2021-08-25 15:47:21,408 DEBUG Snap gtk-common-themes is not tracking the release channel
2021-08-25 15:47:23,018 DEBUG Snap core is installed
2021-08-25 15:47:23,019 DEBUG Snap core is not tracking the release channel
2021-08-25 15:47:23,738 DEBUG Snap core20 is installed
2021-08-25 15:47:23,738 DEBUG Snap core20 is not tracking the release channel
2021-08-25 15:47:24,468 DEBUG Snap flutter is installed
2021-08-25 15:47:24,468 DEBUG Snap flutter is not tracking the release channel
2021-08-25 15:47:24,717 DEBUG Snap gimp is installed
2021-08-25 15:47:24,718 DEBUG Snap gimp is not tracking the release channel
2021-08-25 15:47:25,307 DEBUG Snap gnome-3-28-1804 is installed
2021-08-25 15:47:25,307 DEBUG Snap gnome-3-28-1804 is not tracking the release channel
2021-08-25 15:47:25,486 DEBUG Snap gnome-3-38-2004 is installed
2021-08-25 15:47:25,486 DEBUG Snap gnome-3-38-2004 is not tracking the release channel
2021-08-25 15:47:25,687 DEBUG Snap gtk2-common-themes is installed
2021-08-25 15:47:25,687 DEBUG Snap gtk2-common-themes is not tracking the release channel
2021-08-25 15:47:25,972 DEBUG Snap kde-frameworks-5-core18 is installed
2021-08-25 15:47:25,973 DEBUG Snap kde-frameworks-5-core18 is not tracking the release channel
2021-08-25 15:47:26,249 DEBUG Snap signal-desktop is installed
2021-08-25 15:47:26,249 DEBUG Snap signal-desktop is not tracking the release channel
2021-08-25 15:47:26,483 DEBUG Snap slack is installed
2021-08-25 15:47:26,483 DEBUG Snap slack is not tracking the release channel
2021-08-25 15:47:28,828 DEBUG MetaPkgs: ubuntu-desktop
2021-08-25 15:47:33,444 DEBUG Foreign: code dropbox megasync nodejs obs-studio opera-stable typora unetbootin unetbootin-translations yarn
2021-08-25 15:47:33,444 DEBUG Obsolete: adobereader-enu:i386 atom discord docker-ce drive google-chrome-stable teamviewer virtualbox-6.0 xnconvert zoom
2021-08-25 15:47:33,444 DEBUG updateSourcesList()
2021-08-25 15:47:33,459 DEBUG rewriteSourcesList() with mirror_check
2021-08-25 15:47:33,460 DEBUG ['ubuntu-minimal', 'ubuntu-standard']
2021-08-25 15:47:33,460 DEBUG Checking pkg: ubuntu-minimal
2021-08-25 15:47:33,462 DEBUG Checking pkg: ubuntu-standard
2021-08-25 15:47:33,465 DEBUG examining: 'deb http://fr.archive.ubuntu.com/ubuntu/ bionic main restricted'
2021-08-25 15:47:33,465 DEBUG verifySourcesListEntry: deb http://fr.archive.ubuntu.com/ubuntu/ focal main restricted
2021-08-25 15:47:33,465 DEBUG url_downloadable: http://fr.archive.ubuntu.com/ubuntu//dists/focal/Release
2021-08-25 15:47:33,465 DEBUG s='http' n='fr.archive.ubuntu.com' p='/ubuntu//dists/focal/Release' q='' f=''
2021-08-25 15:47:33,487 DEBUG entry 'deb http://fr.archive.ubuntu.com/ubuntu/ focal main restricted' updated to new dist
2021-08-25 15:47:33,487 DEBUG examining: 'deb http://fr.archive.ubuntu.com/ubuntu/ bionic-updates main restricted'
2021-08-25 15:47:33,488 DEBUG entry 'deb http://fr.archive.ubuntu.com/ubuntu/ focal-updates main restricted' updated to new dist
2021-08-25 15:47:33,488 DEBUG examining: 'deb http://fr.archive.ubuntu.com/ubuntu/ bionic universe'
2021-08-25 15:47:33,488 DEBUG entry 'deb http://fr.archive.ubuntu.com/ubuntu/ focal universe' updated to new dist
2021-08-25 15:47:33,488 DEBUG examining: 'deb http://fr.archive.ubuntu.com/ubuntu/ bionic-updates universe'
2021-08-25 15:47:33,488 DEBUG entry 'deb http://fr.archive.ubuntu.com/ubuntu/ focal-updates universe' updated to new dist
2021-08-25 15:47:33,488 DEBUG examining: 'deb http://fr.archive.ubuntu.com/ubuntu/ bionic multiverse'
2021-08-25 15:47:33,488 DEBUG entry 'deb http://fr.archive.ubuntu.com/ubuntu/ focal multiverse' updated to new dist
2021-08-25 15:47:33,488 DEBUG examining: 'deb http://fr.archive.ubuntu.com/ubuntu/ bionic-updates multiverse'
2021-08-25 15:47:33,488 DEBUG entry 'deb http://fr.archive.ubuntu.com/ubuntu/ focal-updates multiverse' updated to new dist
2021-08-25 15:47:33,488 DEBUG examining: 'deb http://fr.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse'
2021-08-25 15:47:33,488 DEBUG entry 'deb http://fr.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse' updated to new dist
2021-08-25 15:47:33,489 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu bionic-security main restricted'
2021-08-25 15:47:33,489 DEBUG verifySourcesListEntry: deb http://security.ubuntu.com/ubuntu focal main restricted
2021-08-25 15:47:33,489 DEBUG url_downloadable: http://security.ubuntu.com/ubuntu/dists/focal/Release
2021-08-25 15:47:33,489 DEBUG s='http' n='security.ubuntu.com' p='/ubuntu/dists/focal/Release' q='' f=''
2021-08-25 15:47:33,677 DEBUG entry 'deb http://security.ubuntu.com/ubuntu focal-security main restricted' updated to new dist
2021-08-25 15:47:33,677 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu bionic-security universe'
2021-08-25 15:47:33,677 DEBUG entry 'deb http://security.ubuntu.com/ubuntu focal-security universe' updated to new dist
2021-08-25 15:47:33,677 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu bionic-security multiverse'
2021-08-25 15:47:33,677 DEBUG entry 'deb http://security.ubuntu.com/ubuntu focal-security multiverse' updated to new dist
2021-08-25 15:47:33,677 DEBUG examining: 'deb https://typora.io/linux ./'
2021-08-25 15:47:33,679 DEBUG entry '# deb https://typora.io/linux ./ # désactivé pour la mise à niveau vers focal' was disabled (unknown mirror)
2021-08-25 15:47:33,679 DEBUG examining: 'deb http://ppa.launchpad.net/obsproject/obs-studio/ubuntu bionic main'
2021-08-25 15:47:33,681 DEBUG entry '# deb http://ppa.launchpad.net/obsproject/obs-studio/ubuntu focal main # désactivé pour la mise à niveau vers focal' was disabled (unknown mirror)
2021-08-25 15:47:33,681 DEBUG examining: 'deb [arch=i386,amd64] http://linux.dropbox.com/ubuntu bionic main'
2021-08-25 15:47:33,682 DEBUG entry '# deb [arch=i386,amd64] http://linux.dropbox.com/ubuntu focal main # désactivé pour la mise à niveau vers focal' was disabled (unknown mirror)
2021-08-25 15:47:33,682 DEBUG examining: 'deb https://deb.opera.com/opera-stable/ stable non-free #Opera Browser (final releases)'
2021-08-25 15:47:33,684 DEBUG entry '# deb https://deb.opera.com/opera-stable/ stable non-free #Opera Browser (final releases) désactivé pour la mise à niveau vers focal' was disabled (unknown mirror)
2021-08-25 15:47:33,684 DEBUG examining: 'deb http://ppa.launchpad.net/gezakovacs/ppa/ubuntu bionic main'
2021-08-25 15:47:33,686 DEBUG entry '# deb http://ppa.launchpad.net/gezakovacs/ppa/ubuntu focal main # désactivé pour la mise à niveau vers focal' was disabled (unknown mirror)
2021-08-25 15:47:33,686 DEBUG examining: 'deb https://mega.nz/linux/MEGAsync/xUbuntu_18.04/ ./'
2021-08-25 15:47:33,688 DEBUG entry '# deb https://mega.nz/linux/MEGAsync/xUbuntu_18.04/ ./ # désactivé pour la mise à niveau vers focal' was disabled (unknown mirror)
2021-08-25 15:47:33,688 DEBUG examining: 'deb [arch=amd64,arm64,armhf] http://packages.microsoft.com/repos/code stable main'
2021-08-25 15:47:33,690 DEBUG entry '# deb [arch=amd64,arm64,armhf] http://packages.microsoft.com/repos/code stable main # désactivé pour la mise à niveau vers focal' was disabled (unknown mirror)
2021-08-25 15:47:52,066 DEBUG running doUpdate() (showErrors=True)
2021-08-25 15:48:05,119 DEBUG openCache()
2021-08-25 15:48:05,961 DEBUG Comparing 4.15.0-153 with
2021-08-25 15:48:05,961 DEBUG Comparing 4.15.0-154 with 4.15.0-153
2021-08-25 15:48:06,188 DEBUG /openCache(), new cache size 71197
2021-08-25 15:48:06,189 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')
2021-08-25 15:48:06,189 DEBUG quirks: running PreDistUpgradeCache
2021-08-25 15:48:06,189 DEBUG running Quirks.PreDistUpgradeCache
2021-08-25 15:48:06,189 INFO checking for python-dbg (auto_inst=False)
2021-08-25 15:48:06,189 INFO checking for python-doc (auto_inst=False)
2021-08-25 15:48:06,189 INFO checking for python-minimal (auto_inst=False)
2021-08-25 15:48:06,189 INFO installing python-is-python2 because python-minimal was installed
2021-08-25 15:48:06,189 DEBUG Installing 'python-is-python2' (python-minimal was installed on the system)
2021-08-25 15:48:06,223 INFO removing python-minimal because python-is-python2 is being installed
2021-08-25 15:48:06,223 DEBUG Removing 'python-minimal' (python-is-python2 is being installed on the system)
2021-08-25 15:48:06,253 INFO failed to remove python-minimal
2021-08-25 15:48:06,253 INFO checking for python-dev (auto_inst=False)
2021-08-25 15:48:06,253 INFO checking for libpython-dev (auto_inst=False)
2021-08-25 15:48:06,254 INFO checking for libpython-stdlib (auto_inst=False)
2021-08-25 15:48:06,254 INFO removing libpython-stdlib because None is being installed
2021-08-25 15:48:06,254 DEBUG Removing 'libpython-stdlib' (None is being installed on the system)
2021-08-25 15:48:06,283 INFO failed to remove libpython-stdlib
2021-08-25 15:48:06,283 INFO checking for libpython-dbg (auto_inst=False)
2021-08-25 15:48:06,283 INFO checking for python-dbg (auto_inst=True)
2021-08-25 15:48:06,284 INFO checking for python-doc (auto_inst=True)
2021-08-25 15:48:06,284 INFO checking for python-minimal (auto_inst=True)
2021-08-25 15:48:06,284 INFO installing python-is-python2 because python-minimal was installed
2021-08-25 15:48:06,284 DEBUG Installing 'python-is-python2' (python-minimal was installed on the system)
2021-08-25 15:48:06,315 INFO removing python-minimal because python-is-python2 is being installed
2021-08-25 15:48:06,315 DEBUG Removing 'python-minimal' (python-is-python2 is being installed on the system)
2021-08-25 15:48:06,315 INFO failed to remove python-minimal
2021-08-25 15:48:06,315 INFO checking for python-dev (auto_inst=True)
2021-08-25 15:48:06,315 INFO checking for libpython-dev (auto_inst=True)
2021-08-25 15:48:06,315 INFO checking for libpython-stdlib (auto_inst=True)
2021-08-25 15:48:06,315 INFO removing libpython-stdlib because None is being installed
2021-08-25 15:48:06,315 DEBUG Removing 'libpython-stdlib' (None is being installed on the system)
2021-08-25 15:48:06,316 INFO failed to remove libpython-stdlib
2021-08-25 15:48:06,316 INFO checking for libpython-dbg (auto_inst=True)
"

Searching in my ppa, I didn't find any ppa enabled with an other source than ubuntu.

Thanks for your help.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.44
ProcVersionSignature: Ubuntu 4.15.0-154.161-generic 4.15.18
Uname: Linux 4.15.0-154-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.24
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Wed Aug 25 15:52:19 2021
InstallationDate: Installed on 2018-04-01 (1241 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-08-25 (0 days ago)
VarLogDistupgradeTermlog:

[Brian Murray (brian-murray)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1889250, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.