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I have a VAIO Laptop running Ubuntu 12.04 (64 bit). I use a wired internet connection. I want to share this connection using my laptop's wifi as access point. How can i do this?

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you can't. Because laptop provide wireless receiver, not transmitter. To send wireless signal you need a transmitter or transceiver. So need a wireless router for this. – shantanu Aug 5 '12 at 5:28
up vote 2 down vote accepted

Click on the networking icon in the top right hand corner,and choose the Create New Wireless Network option. Enter a name for your network, choose the security you require and set up a security key (if security is enabled). Hit Create and your wireless network will be create and begin broadcasting.

This process depends on your card supporting the ad-hoc connection mode.

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