sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 437D05B5
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.aBKQVd8d9b --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver keyserver.ubuntu.com --recv-keys 437D05B5
gpg: solicitando clave 437D05B5 de hkp servidor keyserver.ubuntu.com
gpg: clave 437D05B5: «Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>» 22 firmas nuevas
gpg: no se encuentran claves totalmente fiables
gpg: Cantidad total procesada: 1
gpg:         nuevas firmas: 22