Currently upgrading Debian Lenny to Squeeze is not that easy, because PostgreSQL 8.3 from Lenny is getting to be removed while PostgreSQL 8.4 won’t be installed because of some dependency issues:  # apt-get install postgresql-8.4 postgresql-8.4-postgis postgresql-contrib-8.4 Reading package lists… Done… Read moreUpgrading PostgreSQL 8.3 to 8.4 on Squeeze