$ curl -fsSL http://deb.ayufan.eu/orgs/ayufan-rock64/archive.key | sudo apt-key add -
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan-rock64 stretch releases"
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan-rock64 jessie releases"
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan-rock64 xenial releases"
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan-rock64 bionic releases"
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan-rock64 stretch releases pre-releases"
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan-rock64 jessie releases pre-releases"
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan-rock64 xenial releases pre-releases"
$ sudo add-apt-repository "deb http://deb.ayufan.eu/orgs/ayufan-rock64 bionic releases pre-releases"
$ sudo apt-get update