[xubuntu] x120e cannot connect to internet

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http://ubuntuforums.org – Hi. I have a Lenovo x120e and i just installed xubuntu on it. Xubuntu recognizes the wifi card and shows the wireless network at my house as within range with good signal. However, it cannot connect. I tried installing the Realtek driver, but failed because I don't know how to install the .sh files. What should i do? (Hardware)