Unable to get Updates, E-Mail and Internet Access, Ubuntu 12.04 LTS

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http://askubuntu.com – I am using a wireless connection. The connection icon in the upper right hand corner of the screen indicates I am indeed connected, yet update manager, e-mail connections and internet access fail. OS is Ubuntu 12.04 LTS. I am using my work computer to access this help site hoping some direction for these issues. I am new to Ubuntu and Linux as a whole. The last update indicated is July 30th. That said, any suggestions for diagnostic steps or any other helpful directions would be appreciated. ping -c4 and route | grep default didn't return anything. ifconfig: eth0 Link encap (HowTos)