ubuntu-bionic-apt-sources.list

deb [arch=arm64,armhf] http://ports.ubuntu.com/ubuntu-ports/ bionic main restricted universe multiverse
deb [arch=arm64,armhf] http://ports.ubuntu.com/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb [arch=arm64,armhf] http://ports.ubuntu.com/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb [arch=arm64,armhf] http://ports.ubuntu.com/ubuntu-ports/ bionic-security main restricted universe multiverse