Why Google Play is not working?

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http://forums.androidcentral.com – I have Ubuntu 12.04. I virtually created a AP and got internet connection to my phone via wifi. Now the browser and Youtube app is working fine. But all the other apps are not working including Gmail, Facebook, Twitter, Google Play. They ask for a data connection when i try to open it. Why is this happening? All the apps which connects with my gmail account have the same problem.:-\ (HowTos)