I'd advise against using this guide. The DSA key recommendation is terrible, either go 4096 RSA or Ed25519/Curve25519. Secondly, use whatever keyring manager

I'd advise against using this guide. The DSA key recommendation is terrible, either go 4096 RSA or Ed25519/Curve25519. Secondly, use whatever keyring manager your distro has available and that supports your keys and is nice to use. GPA is okay-ish and offers most options.