There is one notable misconfiguration: the crappy ISP (which doesn't
support IPv6) routinely sends Martian packets in through the ADSL modem.
This includes ARP, which the modem helpfully broadcasts onto the LAN. So
although the modem doesn't support IPv6, Ubuntu is seeing IPv6 ARP
packets and may be deciding that there is IPv6 on the network.

However, since there is only a link-local IPv6 address configured, that
would be an incorrect assumption. No other application exhibits this
fault (though they may be performing a similar fallback in software,
disguising the issue).

Whatever the cause, it's a real-world scenario that users have no
control over, and we need to code for it. So I'm happy to hear this has
been patched. Thanks! If the problem recurs, I'll file another bug.

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https://bugs.launchpad.net/bugs/1759118

Title:
  apt attempts to connect to IPv6 addresses even when there is no IPv6
  route

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