[ubuntu] Constantly have to run apt-get update

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http://ubuntuforums.org – (Disclaimer: I apologize in advanced if this is posted elsewhere. I searched and couldn't find any similar situations) OS Ubuntu 11.10 Hardware Toshiba Laptop Network Connection Casual Wireless Whenever I try to install a new package, either with apt-get install or with the Ubuntu Software Center, I am unable to do so until I run an apt-get update command. Apt-get install will tell me the package cannot be authenticated and asks if I want to procedd without verification. If I try to install through the Software Center it prompts me for credentials and then tells me it can't connect and to (Hardware)