In that case I would remove one at a time starting with eth1 as eth0 is normally wired network. Basically network manager will only manage a wifi card that isn't already managed so you need to remove the cards details from interfaces so that network manager can use it.
-- Feisty regression: wifi not working (rt2500, wg54t) https://launchpad.net/bugs/82711 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
