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  Is you institution / office is using proxy, then here is the solution to bypass the proxy in your Ubuntu system. here is the solution How to set Proxy In Ubuntu: STEP 1: Open network connection open network connection–>make a manual proxy type the proxy ip address and port number say 172.16.8.1 port number 3128 and click set to system wide button. STEP 2: Open Terminal Login to root user :         ~$ su   then type the root user password STEP 3: Open Config file type the following command         ~$ gedit /etc/atp/apt.config now the config file will open in the text editor. STEP 4: Enter username and password of proxy now copy and paste the following in the text editor Acquire::http::proxy “ http://username:password@proxyserver:port/ Acquire::https::proxy “ https://username:password@proxyserver:port/ Acquire::socks::proxy “socks://username:password@proxyserver:port/”; change the username as your given username and password as your given p