Error in upgrading to Ubuntu 20

[Stefano Musso]

2020-12-10 08:51:21,025 DEBUG quirks: running PreDistUpgradeCache
2020-12-10 08:51:21,025 DEBUG running Quirks.PreDistUpgradeCache
2020-12-10 08:51:21,025 INFO checking for python-dbg
2020-12-10 08:51:21,025 INFO installing python2-dbg because python-dbg was installed
2020-12-10 08:51:21,025 DEBUG Installing 'python2-dbg' (python-dbg was installed on the system)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.41
ProcVersionSignature: Ubuntu 5.4.0-56.62~18.04.1-generic 5.4.73
Uname: Linux 5.4.0-56-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.20
Architecture: amd64
CrashDB: ubuntu
Date: Thu Dec 10 09:11:01 2020
InstallationDate: Installed on 2019-03-12 (638 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-12-10 (0 days ago)
VarLogDistupgradeTermlog:

[Daniel Letzeisen (dtl131)]

You still have PPA's enabled in your sources. You need to purge packages from them (use ppa-purge command) before you can continue.

deb http://ppa.launchpad.net/webupd8team/java/ubuntu bionic main
deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu bionic main

deb http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu bionic main
deb-src http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu bionic main

deb https://download.docker.com/linux/ubuntu bionic main
deb-src https://download.docker.com/linux/ubuntu bionic main

deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main

deb [arch=amd64] http://packages.microsoft.com/repos/vscode stable main