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I did a fresh Ubuntu 12.04 install on my Sony Vaio laptop, which worked perfectly with 10.04. Now my wireless won't work. I have read just about every Q&A on the subject and I have tried different solutions, including the official troubleshooting guides.

My laptop is equipped with a Intel 5100 wireless device. Ubuntu recognizes the device and it's status is given as connected in nm-tool. I can ping the gateway, my own IP number and localhost. Rfkill shows no soft or hard blocks.

  • I can ping 8.8.8.8. Average time is about 15ms.

Any ideas? I am just a few hours shy of reinstalling good old 10.04!

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can you ping global dns servers? like google's 8.8.8.8? –  Web-E Nov 23 '12 at 10:34
    
Yes, I can ping 8.8.8.8. Average time is about 15ms. –  Taake Manning Nov 23 '12 at 10:58
    
so you are connected to internet and speed is also good. wi-fi device is working fine. problem is somewhere else, check the configs –  Web-E Nov 23 '12 at 12:55
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2 Answers

I have had a similar problem. However it was pointed out (on another forum) that the kernel has been updated and that I should look for an updated driver. My wifi is via a usb dongle so I got the update from Realtek's site.

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As far as I am aware (= I can find on intel's site) there are no updated drivers for linux later than 2010. –  Taake Manning Nov 23 '12 at 11:02
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Please try:

    sudo modprobe -r iwlwifi
    sudo modprobe iwlwifi 11n_disable=1

Does it help? If so, write a conf file:

    gksudo gedit /etc/modprobe.d/iwlwifi.conf

Add a new line:

    options iwlwifi 11n_disable=1

Proofread, save and close gedit.

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