9.3 debian install setup failure

9.3 install on debian jessie  64amd

sudo -u postgres psql  => worked
alter user postgres with password 'password'  => alter role

su - postgress
enter password  =>  authentication failure

hba.conf edited to allow "trust" to local  - shouldn't this be set up as
standard default ?

still authentication failure (after rebooting)

now sudo -u postgres psql  =>  could not connect - is server running  -
shouldn't install set up server to be booted on start up ?