Code: Select all
apt policy rng-tools
Isn't some entropy saved to disk so that its available immediately on boot up?
Don't know about that, but there used to be a problem with headless VNC taking a long time to reconnect after a reboot (due to lack of entropy), and installing haveged or rng-tools seemed to fix it. Because of that, the Raspbian devs started including rng-tools by default in some version of Stretch (don't recall exactly when). So later versions of Stretch and all versions of Buster should have it.