lp_publish@pepo:/srv/launchpad.net/ubuntu-archive/ubuntu/dists$ for i in precise trusty xenial yakkety; do find $i-proposed/main/dist-upgrader-* -name \*.gpg; done
precise-proposed/main/dist-upgrader-all/0.156.14.20/precise.tar.gz.gpg
precise-proposed/main/dist-upgrader-all/0.156.14.19/precise.tar.gz.gpg
precise-proposed/main/dist-upgrader-all/0.156.14.18/precise.tar.gz.gpg
trusty-proposed/main/dist-upgrader-all/0.220.7/trusty.tar.gz.gpg
trusty-proposed/main/dist-upgrader-all/0.220.8/trusty.tar.gz.gpg
trusty-proposed/main/dist-upgrader-all/0.220.6/trusty.tar.gz.gpg
xenial-proposed/main/dist-upgrader-all/16.04.16/xenial.tar.gz.gpg
xenial-proposed/main/dist-upgrader-all/16.04.17/xenial.tar.gz.gpg
xenial-proposed/main/dist-upgrader-all/16.04.18/xenial.tar.gz.gpg
yakkety-proposed/main/dist-upgrader-all/16.10.7/yakkety.tar.gz.gpg
yakkety-proposed/main/dist-upgrader-all/16.10.8/yakkety.tar.gz.gpg
yakkety-proposed/main/dist-upgrader-all/16.10.6/yakkety.tar.gz.gpg