Hello,
Still cannot update from up to date 18.04.5 LTS to 20.
I have tried to re install every python package...deactivate every PPAs...


2021-02-21 08:32:44,663 INFO Using config files '['./DistUpgrade.cfg.bionic']'
2021-02-21 08:32:44,664 INFO uname information: 'Linux yann-ThinkPad-E590 5.4.0-65-generic #73~18.04.1-Ubuntu SMP Tue Jan 19 09:02:24 UTC 2021 x86_64'
2021-02-21 08:32:45,157 INFO apt version: '1.6.12ubuntu0.2'
2021-02-21 08:32:45,157 INFO python version: '3.6.9 (default, Oct  8 2020, 12:12:24) 
[GCC 8.4.0]'
2021-02-21 08:32:45,162 INFO release-upgrader version '20.04.29' started
2021-02-21 08:32:45,227 INFO locale: 'fr_FR' 'UTF-8'
2021-02-21 08:32:45,544 DEBUG Using 'DistUpgradeViewGtk3' view
2021-02-21 08:32:45,584 DEBUG enable dpkg --force-overwrite
2021-02-21 08:32:45,599 DEBUG creating statefile: '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'
2021-02-21 08:32:49,070 DEBUG lsb-release: 'bionic'
2021-02-21 08:32:49,070 DEBUG _pythonSymlinkCheck run
2021-02-21 08:32:49,071 DEBUG openCache()
2021-02-21 08:32:49,071 DEBUG quirks: running PreCacheOpen
2021-02-21 08:32:49,071 DEBUG running Quirks.PreCacheOpen
2021-02-21 08:32:50,070 DEBUG Comparing 5.4.0-64 with 
2021-02-21 08:32:50,070 DEBUG Comparing 5.4.0-65 with 5.4.0-64
2021-02-21 08:32:50,268 DEBUG /openCache(), new cache size 101813
2021-02-21 08:32:50,269 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-mate-core')
2021-02-21 08:32:50,269 DEBUG checkViewDepends()
2021-02-21 08:32:50,273 DEBUG running doUpdate() (showErrors=False)
2021-02-21 08:32:51,208 DEBUG openCache()
2021-02-21 08:32:52,215 DEBUG Comparing 5.4.0-64 with 
2021-02-21 08:32:52,215 DEBUG Comparing 5.4.0-65 with 5.4.0-64
2021-02-21 08:32:52,427 DEBUG /openCache(), new cache size 101813
2021-02-21 08:32:52,427 DEBUG doPostInitialUpdate
2021-02-21 08:32:52,427 DEBUG quirks: running focalPostInitialUpdate
2021-02-21 08:32:52,427 DEBUG running Quirks.focalPostInitialUpdate
2021-02-21 08:32:54,881 DEBUG MetaPkgs: ubuntu-mate-core ubuntu-mate-desktop
2021-02-21 08:32:57,852 DEBUG Foreign: 
2021-02-21 08:32:57,852 DEBUG Obsolete: code golang-1.15-go golang-1.15-src google-chrome-stable grive linux-hwe-5.4-headers-5.4.0-56 skypeforlinux teams
2021-02-21 08:32:57,853 DEBUG updateSourcesList()
2021-02-21 08:32:57,868 DEBUG rewriteSourcesList() with mirror_check
2021-02-21 08:32:57,868 DEBUG ['ubuntu-minimal', 'ubuntu-standard']
2021-02-21 08:32:57,868 DEBUG Checking pkg: ubuntu-minimal
2021-02-21 08:32:57,871 DEBUG Checking pkg: ubuntu-standard
2021-02-21 08:32:57,873 DEBUG examining: 'deb http://fr.archive.ubuntu.com/ubuntu/ bionic main restricted'
2021-02-21 08:32:57,873 DEBUG verifySourcesListEntry: deb http://fr.archive.ubuntu.com/ubuntu/ focal main restricted
2021-02-21 08:32:57,873 DEBUG url_downloadable: http://fr.archive.ubuntu.com/ubuntu//dists/focal/Release
2021-02-21 08:32:57,873 DEBUG s='http' n='fr.archive.ubuntu.com' p='/ubuntu//dists/focal/Release' q='' f=''
2021-02-21 08:32:57,975 DEBUG entry 'deb http://fr.archive.ubuntu.com/ubuntu/ focal main restricted' updated to new dist
2021-02-21 08:32:57,975 DEBUG examining: 'deb http://fr.archive.ubuntu.com/ubuntu/ bionic-updates main restricted'
2021-02-21 08:32:57,975 DEBUG entry 'deb http://fr.archive.ubuntu.com/ubuntu/ focal-updates main restricted' updated to new dist
2021-02-21 08:32:57,975 DEBUG examining: 'deb http://fr.archive.ubuntu.com/ubuntu/ bionic universe'
2021-02-21 08:32:57,976 DEBUG entry 'deb http://fr.archive.ubuntu.com/ubuntu/ focal universe' updated to new dist
2021-02-21 08:32:57,976 DEBUG examining: 'deb http://fr.archive.ubuntu.com/ubuntu/ bionic-updates universe'
2021-02-21 08:32:57,976 DEBUG entry 'deb http://fr.archive.ubuntu.com/ubuntu/ focal-updates universe' updated to new dist
2021-02-21 08:32:57,976 DEBUG examining: 'deb http://fr.archive.ubuntu.com/ubuntu/ bionic multiverse'
2021-02-21 08:32:57,976 DEBUG entry 'deb http://fr.archive.ubuntu.com/ubuntu/ focal multiverse' updated to new dist
2021-02-21 08:32:57,976 DEBUG examining: 'deb http://fr.archive.ubuntu.com/ubuntu/ bionic-updates multiverse'
2021-02-21 08:32:57,977 DEBUG entry 'deb http://fr.archive.ubuntu.com/ubuntu/ focal-updates multiverse' updated to new dist
2021-02-21 08:32:57,977 DEBUG examining: 'deb http://fr.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse'
2021-02-21 08:32:57,977 DEBUG entry 'deb http://fr.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse' updated to new dist
2021-02-21 08:32:57,977 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu bionic-security main restricted'
2021-02-21 08:32:57,977 DEBUG verifySourcesListEntry: deb http://security.ubuntu.com/ubuntu focal main restricted
2021-02-21 08:32:57,977 DEBUG url_downloadable: http://security.ubuntu.com/ubuntu/dists/focal/Release
2021-02-21 08:32:57,978 DEBUG s='http' n='security.ubuntu.com' p='/ubuntu/dists/focal/Release' q='' f=''
2021-02-21 08:32:58,337 DEBUG entry 'deb http://security.ubuntu.com/ubuntu focal-security main restricted' updated to new dist
2021-02-21 08:32:58,337 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu bionic-security universe'
2021-02-21 08:32:58,337 DEBUG entry 'deb http://security.ubuntu.com/ubuntu focal-security universe' updated to new dist
2021-02-21 08:32:58,337 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu bionic-security multiverse'
2021-02-21 08:32:58,337 DEBUG entry 'deb http://security.ubuntu.com/ubuntu focal-security multiverse' updated to new dist
2021-02-21 08:32:58,345 DEBUG running doUpdate() (showErrors=True)
2021-02-21 08:33:09,219 DEBUG openCache()
2021-02-21 08:33:10,111 DEBUG Comparing 5.4.0-64 with 
2021-02-21 08:33:10,111 DEBUG Comparing 5.4.0-65 with 5.4.0-64
2021-02-21 08:33:10,331 DEBUG /openCache(), new cache size 67751
2021-02-21 08:33:10,332 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-mate-core')
2021-02-21 08:33:10,333 DEBUG quirks: running PreDistUpgradeCache
2021-02-21 08:33:10,333 DEBUG running Quirks.PreDistUpgradeCache
2021-02-21 08:33:10,333 INFO checking for python-dbg
2021-02-21 08:33:10,333 INFO installing python2-dbg because python-dbg was installed
2021-02-21 08:33:10,333 DEBUG Installing 'python2-dbg' (python-dbg was installed on the system)
2021-02-21 08:33:15,693 ERROR Dist-upgrade failed: 'E:Impossible de corriger les problèmes, des paquets défectueux sont en mode « garder en l'état ».'
2021-02-21 08:33:15,695 DEBUG abort called
2021-02-21 08:33:15,697 DEBUG openCache()
2021-02-21 08:33:19,377 DEBUG Comparing 5.4.0-64 with 
2021-02-21 08:33:19,377 DEBUG Comparing 5.4.0-65 with 5.4.0-64
2021-02-21 08:33:19,745 DEBUG /openCache(), new cache size 101813