I was using PostgreSQL 8.4. I tried removing it through Synaptic Manager and then I tried to install 9.1, but I still version 8.4. I deleted all the files associated with postgresql. Now I am unable to install any version of PostgreSQL. When I try I get this error: Setting up postgresql-9.1 (9.1.3-1~lucid) ... .: 12: Can't open /usr/share/postgresql-common/maintscripts-functions dpkg: error processing postgresql-9.1 (--configure): subprocess installed post-installation script returned error exit status 2 dpkg: dependency problems prevent configuration of postgresql: postgresql depends on postgresql-9.1; however: Package postgresql-9.1 is not configured yet. dpkg: error processing postgresql (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. Errors were encountered while processing: postgresql-9.1 postgresql E: Sub-process /usr/bin/dpkg returned an error code (1) Please tell me the way to remove postgres completely so I can install a fresh version.