ubuntu: HP Elitebook 8540p wireless

This is primarily a note for me, but I just spent 3 hours reformatting my HP Elitebook 8540p because I couldn’t get it to connect to my new 802.11n router. ┬áTurns out all I needed to do was switching the security on the router to WPA from WEP. ┬áSo, anyone searching for how to get their Intel Centrino Advanced-N 6200 wireless card running Linux to connect to their 802.11n router, make sure you’re using WPA or it won’t work.