I'm getting this on precise. Tried with free tiberiumalliances and local apt-cacher-ng:
sudo apt-get update [...] Err https://private-ppa.launchpad.net precise/main amd64 Packages Proxy CONNECT aborted Err https://private-ppa.launchpad.net precise/main i386 Packages Proxy CONNECT aborted [...] W: Failed to fetch https://private-ppa.launchpad.net/commercial-ppa- uploaders/tiberiumalliances/ubuntu/dists/precise/main/binary- amd64/Packages Proxy CONNECT aborted W: Failed to fetch https://private-ppa.launchpad.net/commercial-ppa- uploaders/tiberiumalliances/ubuntu/dists/precise/main/binary-i386/Packages Proxy CONNECT aborted -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/647212 Title: purchased software download fails with and breaks apt proxy To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/647212/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs