[Linux] Mengatasi Error "There is no public key available for the following key ID"

Lagi iseng-iseng config server di debian, pas apt-get update kok muncul pesan error "There is no public key available for the following key ID blablabla". Setelah gugling sana-sini ternyata cara mengatasinya cukup dengan menginstall package debian-keyring dan debian-archive-keyring.

apt-get install debian-keyring debian-archive-keyring