Problem installing software from ubuntu software center and error running sudo app-get update and install commands

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.

Can you add info about your internet connection to the question. Are you behind a proxy or firewall? — mikewhatever, Feb 23 '13 at 09:09
i am connecting to the internet via a proxy server that needs authentication — user134816, Feb 23 '13 at 09:18
Looks like your question has been answered a few times: one, two, three. — mikewhatever, Feb 23 '13 at 10:43

score 0 · Answer 1 · answered Feb 23 '13 at 09:57

0

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

answered Feb 23 '13 at 09:57

user134849

11

Problem installing software from ubuntu software center and error running sudo app-get update and install commands

1 Answers1