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Open a terminal and enter "sudo ifconfig -a" See if your wireless is there. Also try dmesg or lspci.
With dmesg, use something like:
dmesg|grep eth
OR
dmesg|grep wlan
If the card does not show up in dmesg or ifconfig -a, it is likely that you need to install a driver.
Please tell us the make and model of your wireless card. It should be in the computer specs or in lspci.
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