Did todays kernel update break something?
It did for me.
The upgrade to linux 2.6.24-18-generic kernel broke my internet.
Network manager was unable to find any device to connect to the internet.
It’s bug #237335 for ubuntu.
If something like this were to happen for you, simply pick the previous kernel in the grub.
And all should be good.
The bug you are having could be fixed soon and then you could use the newest kernel.