I have a lenovo x230 running Ubuntu 12.04 LTS. I've been using it just fine for a while, but all of a sudden the internet's stopped working. It's connected to the router just fine (I can see the antenna bars saying it's connected) but when I try to go to a webpage, it's just loading forever. I've tried the fix listed here
but it hasn't done anything (the instructions are a little confusing though). I'm booting Windows 7 right now and the internet works just fine when I'm on Windows, so I know it must be a problem with Ubuntu. I haven't touched any network settings before this problem happened, and I've been using it just fine for months, so I don't know why I'm getting this problem all of a sudden.
Oh and I haven't updated anything in a few weeks (you know when the update manager pops up every so often listing all the things there's an update for) so I know it's not some update that broke it.