Loading packages... Generating metadata files and linking package files... Finalizing metadata files... Signing file 'main_installer-s390x_current_images_SHA256SUMS' with gpg, please enter your passphrase when prompted: Signing file 'Release' with gpg, please enter your passphrase when prompted: Clearsigning file 'Release' with gpg, please enter your passphrase when prompted: Snapshot stretch has been successfully published. Please setup your webserver to serve directory '${HOME}/.aptly/public' with autoindexing. Now you can add following line to apt sources: deb http://your-server/ stretch main Don't forget to add your GPG key to apt with apt-key. You can also use `aptly serve` to publish your repositories over HTTP quickly.