I thought I would follow up (better late than never...) Turns out my D-Link switch was on the fritz and auto negotiation randomly started failing. There's no other explanation for it. I bought a new switch and all my problems went away. My comments above can be ignored.
-- Gutsy Beta: Ethernet interface (Intel PRO/1000) present but unusable after update https://bugs.launchpad.net/bugs/148232 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs