Couldnot able to install anything

Question

I tried to use

sudo apt-get install

its not working.

So I did ping google.com it gave me

ping: unknown host google.com

I have net connection and I able to access Internet in browser.

How should I proceed?

Answer 1

Which version do you use? Are you using proxy?

Try digging here and here

EDIT:

To use apt-get through a proxy, I do the following -

sudo apt-get --print-uris install PROGRAM

This prints the urls of the packages, so you can download them. For example, using supertux:

wilf@comp:~$ sudo apt-get install --print-uris supertux
Reading package lists... Done
Building dependency tree

Reading state information... Done
The following extra packages will be installed:
  supertux-data
The following NEW packages will be installed
  supertux supertux-data
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 59.4 MB of archives.
After this operation, 80.0 MB of additional disk space will be used.
Do you want to continue [Y/n]? 
    

Then download the .deb files from the given links, through a browser that works through the proxy, and you can then install them using Software Centre, or using terminal by this command cd /FOLDER/WITH/DOWNLOADED-DEB-FILES; dpkg -i *.deb ER cd .... ; gdebi *.deb . Slow and annoying, but seems to work.

EDIT2 : (Easy Method) (from help.ubuntu.com site)

APT configuration file method

This method uses the apt.conf file which is found in your /etc/apt/ directory. This method is useful if you only want apt-get (and not other applications) to use a http-proxy permanently.

On some installations there will be no apt-conf file set up. This procedure will either edit an existing apt-conf file or create a new apt-conf file.

gksudo gedit /etc/apt/apt.conf

Add this line to your /etc/apt/apt.conf file (substitute your details for yourproxyaddress and proxyport).

Acquire::http::Proxy "http://yourproxyaddress:proxyport";

Save the apt.conf file.

If your proxy needs a login/password, substitute:

"http://yourproxyaddress:proxyport";

with

"http://username:password@yourproxyaddress:proxyport";

Something like following should work fine

Acquire::http::proxy "http://lgn:pwd@192.168.1.254:8080/";
Acquire::https::proxy "http://lgn:pwd@192.168.1.254:8080/"