Julian - correct I was using apt-cacher-ng as per sbuild instructions here https://wiki.ubuntu.com/SimpleSbuild
Sorry - I've no idea how to configure squid-deb-proxy with sbuild. So I've deleted my sbuild chroots & disabled using the .mk-sbuildrc proxy. Installing from a ppa no longer shows 503 errors. ** Changed in: apt (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1960264 Title: 503 errors for Jammy PPAs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1960264/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs