$ curl -fsSL http://deb.ayufan.eu/orgs/ayufan/archive.key | sudo apt-key add -
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan stretch releases"
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan jessie releases"
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan xenial releases"
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan bionic releases"
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan stretch releases pre-releases"
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan jessie releases pre-releases"
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan xenial releases pre-releases"
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan bionic releases pre-releases"
$ sudo apt-get update