Getting Error while Updating

[bgaulke]

I keep getting errors trying to update my system and am unable to download the last 14 important updates. Here is the error log:

===========================
Install Updates Error log
===========================
Install Updates could not fetch the package cache information lists.
Go to https://www.freecinema2022.gq/forums/ and paste the log below into a new or existing thread for assistance.

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

Hit:1 http://repo.linuxliteos.com/linuxlite emerald InRelease
Hit:2 http://archive.canonical.com focal InRelease
Hit:3 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-security InRelease
Get:5 https://repo.skype.com/deb stable InRelease [4,502 B]
Hit:6 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:7 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:8 http://dl.google.com/linux/chrome/deb stable InRelease
Err:5 https://repo.skype.com/deb stable InRelease
  The following signatures were invalid: EXPKEYSIG 1F3045A5DF7587C3 Skype Linux Client Repository <[email protected]>
Reading package lists...
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.

I have attempted to fix the problem by using LinuxLite Tweaks, but with no success - errors persist.