Comment 4 for bug 92085

I can confirm that Feisty's NetworkManager indeed misbehaves when there is more than one network card present. I have two cards, one connected to public internet, one is for my home network. Only one card works at the time, I can even use NetworkManager to choose, which one.

As others have noted, temporary workaround is to execute "sudo /etc/inid.d/networking restart" after each boot. It is pain in the... you know, where.