Bug#611891: please give apt.conf.d option to disable ipv6
at home, I get IPv6 connectivity via a tunnel, which is (a) slow and
(b) uses third-party resources that are generously made available free
of charge. I don't want to overuse these resources while still
remainig able to use IPv6 for chatting and VPN purposes.
I therefore do _not_ want to disable IPv6 entirely, but I still do
want apt to do its download over the fast and cheap IPv4 link.
Please consider implementing an option to disable ipv6 for apt only.