I installed postgresql 9.2 from add-apt-repository ppa:pitti/postgresql using apt-get install postgresql-9.2

At the end of the install and every time I try to launch postgresql by using the following command

/etc/init.d/postgresql start

or

service postgresql start

I get this error:

Error: could not exec /usr/lib/postgresql/9.2/bin/pg_ctl    
/usr/lib/postgresql/9.2/bin/pg_ctl start -D /var/lib/postgresql/9.2/main -l 
/var/log/postgresql/postgresql-9.2-main.log -s -o  -c 
config_file="/etc/postgresql/9.2/main/postgresql.conf" :
                                                                    [fail]
invoke-rc.d: initscript postgresql, action "start" failed.
dpkg: error processing postgresql-9.2 (--configure):
subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
postgresql-9.2
E: Sub-process /usr/bin/dpkg returned an error code (1)

I have tried everything found here: How to thoroughly purge and reinstall postgresql on ubuntu and here: Eliminating non working postgresql installations on ubuntu 10-04 and starting af.

I have also done

dpkg -P --force-remove-reinstreq postgresql-client-9.2

in my attempt to remove everything postgres related from my server.

After removing postgresql I have used

dpkg --get-selections | grep postg

To be sure there is nothing left and I can do a clean install.

I have also made sure that the files and folders mentioned in the error message have the right permissions. The /var/log/postgresql/postgresql-9.2-main.log file is empty. I have tried installing every postgresql version from 8.3 to 9.2 and I get the same error on every time. I once managed to compile postgresql from the source provided on their website but then I encountered weird errors with psycopg2 so I figured I'd install postgresql this way and avoid those errors. Also when I type apt-get install postgresql it by default tries to install the 8.3 version even when I can find the package by typing apt-get install postgresql-9.2.