casper's logic in 23networking seems broken. At that point in the install NetworkManager would not be installed. Would it be sufficient to just skip adding the "manual" method interfaces to /etc/network/interfaces, since omitting them would make their use manual? This at least shouldn't break servers, since they don't run NetworkManager, and would probably be reasonable for most users.
Looking at this following triaging bug 678450:
casper's logic in 23networking seems broken. At that point in the install NetworkManager would not be installed. Would it be sufficient to just skip adding the "manual" method interfaces to /etc/network/ interfaces, since omitting them would make their use manual? This at least shouldn't break servers, since they don't run NetworkManager, and would probably be reasonable for most users.