From last few days, Pidgin failed to authenticate many of our yahoo id’s. This was due to discontinued support to Yahoo protocol 16 (Source: Pidgin change log).
Yahoo Protocol 16 support, including new HTTPS login method; this should fix a number of login problems that have recently cropped up.
Pidgin released a new update to resolve this issue. Pidgin 2.5.7 is out. You can install it as given below.
1) Import the public key for Launchpad PPA for Pidgin Developers:
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 67265eb522bdd6b1c69e66ed7fb8bee0a1f196a8
2) Add the following lines to
deb https://ppa.launchpad.net/pidgin-developers/ppa/ubuntu jaunty main
3) Now, Run apt-get update and apt-get upgrade / apt-get install pidgin .
The PPA contains new pidgin releases for other versions of ubuntu ( dapper gutsy, hardy ,intrepid and karmic)
Once this is done, do restart your pidgin and find the yahoo authentication happening fine just like earlier.