This is satisfactorily documented in the man page. The solution, I guess, is to use --old-compress rather than -z, or wait for my other hosts to get with the latest swank.
** Changed in: rsync (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to rsync in Ubuntu. https://bugs.launchpad.net/bugs/1453440 Title: Rsync -z fails under 15.04 with "rsync: on remote machine: --new- compress: unknown option" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rsync/+bug/1453440/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs