I\'m running Kubuntu 11.10 (w/ KDE 4.8)
Before you read all this :
I just want to remove all traces of OpenCV from my system, so I can start afresh..
In order to remove all the files and folders without "interaction", use the below command :
sudo find / -name "*opencv*" -exec rm -rf {} \;
CAUTION: It's not advisable to run "recursive" and "force" deletion.