Local postgresql server and creating new user on linux

I installed postgresql via synaptic on ubuntu.

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Now I dont know how to create new user, run server and create it in pgAdmin3.

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Use this to create a postgres user called $USER:

sudo -u postgres createuser --superuser $USER

Creating a DB with the same name as your user name makes things easier. It becomes your default DB.

createdb $USER

Use this to set a password for USER. This must be done for pgadmin3 to work.

sudo -u postgres psql
postgres=# \password USER