Install updates error

[Sameer Pokharel]

Found below log file after trying to install updates:
===========================
Install Updates Error log
===========================
Install Updates could not fetch the package cache information lists.
Go to https://www.linuxliteos.com/forums/ and paste the log below into a new or existing thread for assistance.

============ Log ===========

Hit:1 http://archive.canonical.com/ubuntu focal InRelease
Ign:2 http://ppa.launchpad.net/pj-assis/ppa/ubuntu focal InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu focal InRelease
Hit:4 http://packages.microsoft.com/repos/code stable InRelease
Hit:5 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:6 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:7 http://repo.linuxliteos.com/linuxlite emerald InRelease
Err:8 http://ppa.launchpad.net/pj-assis/ppa/ubuntu focal Release
  404  Not Found [IP: 91.189.95.85 80]
Get:9 https://repo.skype.com/deb stable InRelease [4,502 B]
Hit:10 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:11 http://dl.google.com/linux/chrome/deb stable InRelease
Err:9 https://repo.skype.com/deb stable InRelease
  The following signatures were invalid: EXPKEYSIG 1F3045A5DF7587C3 Skype Linux Client Repository <[email protected]>
Reading package lists...
E: The repository 'http://ppa.launchpad.net/pj-assis/ppa/ubuntu focal Release' does not have a Release file.
W: GPG error: https://repo.skype.com/deb stable InRelease: The following signatures were invalid: EXPKEYSIG 1F3045A5DF7587C3 Skype Linux Client Repository <[email protected]>
E: The repository 'https://repo.skype.com/deb stable InRelease' is not signed.