arm-sources.list

deb [arch=amd64] http://archive.ubuntu.com/ubuntu/ xenial main multiverse restricted universe
deb [arch=amd64] http://archive.ubuntu.com/ubuntu/ xenial-updates main multiverse restricted universe
deb [arch=amd64] http://security.ubuntu.com/ubuntu/ xenial-security main multiverse restricted universe

deb [arch=armhf] http://ports.ubuntu.com/ubuntu-ports/ xenial main multiverse restricted universe
deb [arch=armhf] http://ports.ubuntu.com/ubuntu-ports/ xenial-updates main multiverse restricted universe

deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports/ xenial main multiverse restricted universe
deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports/ xenial-updates main multiverse restricted universe