Ubuntu: Problem installing software from ubuntu software center and error running sudo app-get update and install commands [duplicate]



Question:

I am new to Ubuntu.

I am getting an error whenever I try to run sudo apt-get update

(407 Proxy authentication required)  

Moreover, I am unable to install any software from Ubuntu software center not even using sudo apt-get install. I have tried every answers mentioned in the related questions here but none of them worked for me.

When I try to play any audio file I am getting following error:

Required plugin could not be found Python (v2.7) required to install plugins to play media files of the following type: MPEG-1 Layer 3 (MP3) decoder  

For this when I try to run following command, getting error:

sudo apt-get install ubuntu-restricted-extras  Reading package lists... Done  Building dependency tree  Reading state information... Done  E: Unable to locate package ubuntu-restricted-extras  

I have been trying this since the last 2-3 days with no fruitful result.


Solution:1

So, you need to configure this on Internet dialogue.In Gnome 2 is on System > Preferences > Internet


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