Dear all,
For once, I will simply publish a solution instead of asking a question.
Let's hope it will be useful to someone.
I was unable to stop postgres, I always got "[FAILED] :
* /etc/init.d/postgresql stop
* service postgresql stop
* /sbin/service postgresql stop
The only solution that worked in that case was :
* /usr/bin/pg_ctl stop
Have a nice day !
Denis