Sky Charts install

[billtour]

This may be unrelated, but, I ran an update and got the following errors:

===========================
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://repo.linuxliteos.com/linuxlite emerald InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu focal InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:6 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:7 http://archive.canonical.com/ubuntu focal InRelease
Get:4 http://vega.ap-i.net/apt stable InRelease [3,615 B]
Err:4 http://vega.ap-i.net/apt stable InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B8B57C1AA716FC2
Reading package lists...
W: GPG error: http://vega.ap-i.net/apt stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B8B57C1AA716FC2
E: The repository 'http://www.ap-i.net/apt stable InRelease' is not signed.