I am newcomer and want to discover pgrouting.
I've already installed postgresql-9.3 and the postgis 2.1 extension on my laptop which runs ubuntu 12.04 Lts precise.
I don't want to have to re-install postgresql.
Now I want to add the pgrouting extension to be able to create routing databases as indicated on the pgroutingworkshop tutorial. But they used postgresql-8 inside.