Hmmm... it appears NetworkManager freaks out when it finds something already existing in /etc/network/interfaces. As soon as I deleted all custom stuff, it worked fine...
-- NetworkManager does not recognise any interface after upgrade to 2.6.20-7 https://launchpad.net/bugs/84307 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs