distribution upgrade fails while creating new software channels

[Chris al Gerges]

when I try to upgrade ubuntu from 16.04 to 18.04, it fails when it's setting new software channels. I then get the error that from apt that an error occurred (depicted as a red circle with a white horizontal line at the top-right). It says that I should run apt-get in my terminal to know what was worng with my packages. So I tried to run apt-get and tried running 'sudo apt-get -f install' or 'sudo apt-get -qq upgrade' in my terminal, but nothing happened. I get no input in my terminal. So I am lost right now. my computer still works perfectly, but I just can't upgrade my distribution version anymore! please help! :(

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.15.0-33.36~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-33-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME-Flashback:Unity
Date: Sun Sep 9 13:46:19 2018
InstallationDate: Installed on 2017-09-01 (372 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-09-09 (0 days ago)
VarLogDistupgradeTermlog: