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Just recently installed ubuntu on my vaio VPCS11X9E. The wifi works fine on windows, and wired works fine on both. The wireless also works perfectly with my school's wifi, but when connecting to my home wifi, I have no internet access. Cannot ping google.com and iwconfig states "no wireless extensions".

Thanks

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Could be you're not using the correct security settings for your wifi at home? e.g. you need to use WPA2-PSK and you're trying to use WPA –  Radu Rădeanu Apr 18 '13 at 15:12
    
If you load a live cd does the wifi behave differently? –  Radu Rădeanu Apr 18 '13 at 15:15

4 Answers 4

Besides not having the proper password entered for your home network, the other slightly-more-remote answers could be that:

  1. your home wifi is using an unsupported WEP authentication method. WPA and WPA2 are the commonly supported protocols;
  2. your wifi connection on the laptop is using a fixed IP address that is not in the same IP range as your home network. Are you using DHCP on the wifi connection?
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I had this problem when my home network could not use the ISPs DNS server. I solved this by using Google DNS.
See here: https://developers.google.com/speed/public-dns/docs/using

To see if this is your problem you could try to ping a site by IP, such as Googles DNS servers! Try in the terminal:

ping 8.8.8.8

and

ping 8.8.4.4

If you get a reply try to ping site by name such as:

ping google.com

If that dosen't work, than DNS is your problem.

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This is going to sound quite dumb, but the only reason i can think for such a case is that your home wifi network is protected by some password and you are not giving the correct password to Ubuntu.

if you can't turn on wifi at all, that probably means some sort of driver incompatibility, but since you can use your wifi at school I am assuming this is not the case.

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just to clarify, I can connect to the wifi, laptop shows up on the network etc. it just doesn't connect to the internet. The passwords are all correct. –  rargh Apr 18 '13 at 17:51
    
Perhaps there is something wrong with your home network Certificates, or protocols. Check the options, they must be compatible between the two networks! –  Flame_Phoenix Apr 18 '13 at 17:53

This looks like it may be helpful: Ubuntu Wireless Troubleshooting

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