Dear Maintainer, When installing apt-build, it automatically adds the repository to sources.list.d/, but with multiarch apt spits out errors on the repository. the default entry for apt-build.list is: deb file:/var/cache/apt-build/repository apt-build main when modified to: deb [arch=amd64] file:/var/cache/apt-build/repository apt-build main this takes care of the errors (amd64 being `dpkg --print-architecture')