After executing the command line
Curl -s https://packagecloud.io/install/repositories/phalcon/stable/script.deb.sh | Sudo bash
This runs correctly but when I want to update I get W: El repositorio «https://packagecloud.io/phalcon/stable/linuxmint serena Release» no tiene un fichero de Publicación.
translated
W: The repository "https://packagecloud.io/phalcon/stable/linuxmint serena Release" does not have a Publication file.
How else do I install phalcon?