To uninstall utalk just follow these instructions.
/ubuntu/vivid/universe///install/index.html talk-like program with additional features Ubuntu 15.04 universe/net 1.0.1.beta-7
sudo apt-get remove utalk
Which will remove just the utalk package itself.
sudo apt-get remove --auto-remove utalk
This will remove the utalk package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for utalk then this will work.
sudo apt-get purge utalk
Or similarly, like this utalk
sudo apt-get purge --auto-remove utalk
|Description||talk-like program with additional features|