When you change your mind or you have installed packages on wrong server this magic command can help:
grep -e `date +%Y-%m-%d` /var/log/dpkg.log | awk '/install / {print $4}' | uniq | xargs apt-get --purge -y remove
Purge config files of removed packages:
aptitude purge `dpkg --get-selections | grep deinstall | awk '{print $1}'`