Possible Duplicate:
Are “PPA's” safe to add to my system, and what are some “red flags” to watch out for?
I installed the plugin mentioned in the following link and after that, by Ubuntu 12.04 LTS behaves a little strange, particularly keyboard shortcuts are not working as expected.
http://www.webupd8.org/2012/03/recoll-lens-full-text-search-unity-lens.html
Actually my worry is not about keyboard shortcuts, but are there any spyware threats by installing 3rd party applications (not through Ubuntu software centre) like that.