I can't update ubuntu to version 20.4. There seems to be a problem with the ppa software

[Mirko Giunta]

I can't update ubuntu to version 20.4. There seems to be a problem with the ppa software.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
Uname: Linux 4.15.0-118-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Tue Sep 29 17:05:49 2020
InstallationDate: Installed on 2017-02-06 (1330 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-09-29 (0 days ago)
VarLogDistupgradeTermlog:

[Brian Murray (brian-murray)]

Your /etc/apt/sources.list file is completely commented out so apt and ubuntu-release-upgrader do not know where to get packages from. You'll need to reenable the Ubuntu archive and then probably installing updates before trying to upgrade again.

[Launchpad Janitor (janitor)]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.]