I'm following these instructions, however I can only get to step 17.2.

Despite installing postgresql successfully via the

sudo apt-get install postgresql

command, upon running

initdb -D /usr/local/pgsql/data

Ubuntu tells me that it 'initdb' isn't installed. The instructions tell me this command is installed by

sudo apt-get install postgresql

so what's going on? I can make initdb available by installing postgres-xc, but I think postgres-xc is just some weird third party rubbish, and it's not detailed in the instructions. Any ideas?