This has been asked before but the solution wasn’t good enough. When id o a sudo apt-get update it gives me an error GPG error http://apt.radxa.com/focal-stable public key is not availabe: NO_PUBKEY 9B98116C9AA302C7.
I’ve tried the solution
wget -O - apt.radxa.com/focal-stable/public.key | sudo apt-key add -
but this just stops the update in it’s shoes. It doesn’t actually go and do an update and it also doesn’t set up an NTP server