How to: Fix Yahoo Problem / Error in Pidgin

Below is a step-by-step tutorial for all Ubuntu users that want to connect with their friends via the Yahoo protocol, using the Pidgin Instant Messenger

1. Right click HERE and choose the "Save Link As..." option. Save the key file on your desktop.
2. Go to System -> Administration -> Software Sources
3. Enter your password if asked. Go to the second tab, "Third-Party Software," click on the "Add" button, and paste the line below for your Ubuntu distribution, in the "APT line" field...
4. Ubuntu 9.10
   
   deb http://ppa.launchpad.net/pidgin-developers/ppa/ubuntu karmic main
   
   Ubuntu 9.04
   
   deb http://ppa.launchpad.net/pidgin-developers/ppa/ubuntu jaunty main
   
   Ubuntu 8.10
   
   deb http://ppa.launchpad.net/pidgin-developers/ppa/ubuntu intrepid main
5. Now go to the fourth tab, "Authentication," click the "Import Key File" button, navigate to the location where you've just saved the key file (usually, it is File System/home/YOURUSERNAME/Desktop) and double click it. You will immediately see a new entry called "A1F196A8 2009-01-20 Launchpad PPA for Pidgin Developers".
6. Click the “Close” button, then the “Reload” one and wait for the application to close!
7. Go to System -> Administration -> Update Manager and update Pidgin to the new version!
8. Close Pidgin if it was running during the update process and open it again. Yahoo should connect immediately now. And the best part is that your Ubuntu machine will always be updated with the latest versions of the Pidgin messenger, from now on!
   
   

Source : softpedia