Networking installation mishap - wireless, eth

[Carthik Sharma]

When installing Ubuntu, I selected my wireless interface as the
"primary" interface. I think this is what is causing my problems
currently.

The wireless card, and accessing work perfectly, thank you :)

The problem, though is that when I turn off the wireless card, and
reboot with the ethernet cable plugged in, I cannot access the
internet.

So,
1) How can I "re-configure" things so that my "primary" interface is
the ethernet card, and the wireless card is secondary?
Or
2) re-configure things so that Ubuntu tries to connect to the
network/internet using the ethernet  (LAN) card  and only if that does
not work does it try to bring up the wireless card ?

Thank you,
Carthik.
-- 
When nothing is done, nothing is left undone -- 老子 Lǎozi

University of Central Florida
Homepage: http://carthik.net