It seems this apt.conf line same from old debian installs... I'm not sure if the fix should be in apt itself or the flashplugin script, but flashplugin should at least work around it by unsetting APT_PROXIES is it equals "false" in postinst, line 59.
This is a dup of Bug #409119 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/742368 Title: flashplugin-installer doesn't install flash plugin To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/flashplugin-nonfree/+bug/742368/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs