For years, I've used Pidgin to instant-message people who use Yahoo Instant Messenger.
Now, in Ubuntu 16.04, I keep getting this message each time I launch pidgin:
This deadline is quickly approaching. Will a pidgin update come via the repository (automatically) before this deadline? If not, what is the best work-around?
A replacement Yahoo! protocol plugin is in progress. The installation instructions for both Windows and Linux are located at the bottom of the README. I tried it about two weeks ago and my Pidgin crashed, you might have better luck as there has been a fair amount of developer activity since.
https://github.com/EionRobb/funyahoo-plusplus