Ubuntu Artful and packagecloud?

Err:11 https://packagecloud.io/phalcon/stable/ubuntu artful Release          
  404  Not Found [IP: 52.219.20.105 443]
Reading package lists... Done
E: The repository 'https://packagecloud.io/phalcon/stable/ubuntu artful Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.

Any way that Artful (Ubuntu 17.10) can get some love? :D

17.10 is not LTS version. IMHO Phalcon should not bother with this, but only with LTS versions. If you really like to try new distros that often - then simply compile Phalcon from source - and there you go.