Trying to upgrade ubuntu 16.04 to 18.04. Received a message saying to purge unofficial software packages from lauchpad using ppa-purge package. But i do not know which package to delete. What should i do? (i'm a beginner to ubuntu)

[Venkata Krishna Guntuka]

Trying to upgrade ubuntu 16.04 to 18.04.
Received a message saying to purge unofficial software packages from lauchpad using ppa-purge package. But i do not know which package to delete. What should i do? (i'm a beginner to ubuntu)

The message also gave option for me to manually investigate in the location: /var/log/dist-upgrade. Speciafically to look at main.log and apt.log.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.32
ProcVersionSignature: Ubuntu 4.15.0-123.126~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-123-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.27
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sat Nov 21 20:00:07 2020
InstallationDate: Installed on 2019-09-22 (425 days ago)
InstallationMedia: Ubuntu 16.04.6 LTS "Xenial Xerus" - Release amd64 (20190227)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2020-11-21 (0 days ago)
VarLogDistupgradeTermlog:

[Tom Reynolds (tomreyn)]

Hi. Thanks for reporting this issue. However, I think this is not a software malfunction, and you're rather looking for support:

https://ubuntu.com/support

For free community support, scroll to the very bottom. Personally, I would recommend real-time IRC support: https://wiki.ubuntu.com/IRC/ChannelList