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I have a lenovo x230 running ubuntu 12.04lts. 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 (http://ubuntuforums.org/showthread.php?t=1985079) 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.

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Open a terminal (Ctrl+Alt+T), and type these commands separately: ifconfig, route -n, cat /etc/resolv.conf, ping -c 4, and ping -c 4 google.com. Copy their outputs and paste them in your question. –  Alaa Jun 6 '13 at 18:13
I put my results in a gist because they're a little long. gist.github.com/anonymous/c001b8ac5a7369d46cfc Thanks so much for your help –  Philip Jun 6 '13 at 19:02
I would also like to see: lspci -nn | grep 0280 –  chili555 Jun 6 '13 at 19:12
it just displayed my network card model, intel centrino advanced n 6205 (i saved the exact output in a txt file then rebooted to windows, but something's wrong with the file. It just printed out the one line with my network card name though). –  Philip Jun 6 '13 at 19:24
At the end of that line, there's a [ven_id#:dev_id#], I guess that's what he wanted to see =). –  Alaa Jun 8 '13 at 12:45
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1 Answer

Possible solution (I have the same laptop):

sudo rmmod iwldvm
sudo modprobe iwlwifi 11n_disable=1
sudo modprobe iwldvm

Now, this only worked for me. I don't actually know what this code does, so use at your own risk.

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