remove postgresql ubuntu

sudo apt-get --purge remove postgresql
sudo apt-get purge postgresql*
sudo apt-get --purge remove postgresql postgresql-doc postgresql-common

sudo aptitude purge postgresql postgresql-common
sudo dpkg -P postgresql-8.4

sudo find / -name postgresql -exec rm -Rf {} \;
sudo find / -name pgsql -exec rm -Rf {} \;
sudo find / -name psql -exec rm -Rf {} \;

sudo userdel postgres