[ubuntu] Updates / software repos

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http://ubuntuforums.org – Hello , just started using ubuntu. installed the 12.04 on my notebook. a week later, i have over 500+ updates ready to be installed. Problem is each time i ask to install, i get an error to check my internet connections and messages like below. i know it has to do with some settings but have not been able to figure this out. any assist will great. Failed to fetch http://archive.ubuntu.com/ubuntu/poo...tu6.4_i386.deb Something wicked happened resolving 'archive.ubuntu.com:http' (-5 - No address associated with hostname) Failed to fetch http://archive.ubuntu.com/ubuntu/poo...tu3.2_i386.deb (Hardware)