I'm having a weird problem. A power surge/outage knocked out my home router, so I went out and bought a new one (that's not my problem). But now, my Ubuntu laptop won't connect to the new router (it will see it, and many others, when I pull up a list of available wireless networks, but it will not connect). My computer connected fine with the previous router, and my wife's Ubuntu laptop connects to the new router just fine (as does Windows on both our computers - both our laptops are dual-boot - and our Android phones connect fine as well).
I had this problem once before a long time ago when switching routers, and solved it by deleting the Wireless network entry for that SSID on my laptop and recreating it. That hasn't helped this time, though.
It occurred to me that there might be some settings buried somewhere in the system that might be causing a conflict that aren't getting deleted, but I don't know where else to look. I don't have any idea what else the problem could be. I also can't tell what the problem is that is preventing my computer to connect. All I can say is it tries for about 30 seconds to connect, and then pops up a message that the wireless is disconnected, and after a few seconds, it will try again, and it will just repeat that until I tell it to stop.
If it matters, I'm running Ubuntu 12.10 64-bit (upgraded from 12.04, if that matters), but then, I was before I switched routers, too. The wireless network is encrypted with WPA2 personal, which I haven't had a problem with before. Also if it matters, my new router is a Netgear N600 (WNDR3400v2).