GPG gives invalid packet (ctb=0a) error when trying to import public keys

Question

Trying to update gives me an error saying public keys are not available:

So I tried to import the keys using apt-key, which raises this invalid packet error:

Answer 1

So I managed to fix this myself.

Issue:

gpg keyring is damaged

Soulution:

1. Delete /etc/apt/trusted.gpg and all .gpg files in /etc/apt/trusted.gpg.d/
2. Download launchpad-getkeys binary and execute it as sudo