“sudo apt-key adv-keyserver keys.gnupg.net--recv-key 6f3Efcde” Código de respuesta

sudo apt-key adv-keyserver keys.gnupg.net--recv-key 6f3Efcde

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys C8B3A55A6F3EFCDE
sudo apt-get update