title: installed postegres on but it says not installed
body: <p>I am trying to install postgres on my ubuntu machine following this tutorial:
  <a href="https://www.digitalocean.com/community/tutorials/how-to-install-and-use-postgresql-on-ubuntu-14-04" rel="nofollow">https://www.digitalocean.com/community/tutorials/how-to-install-and-use-postgresql-on-ubuntu-14-04</a></p>
  
  <p>I can create new users,  use the psql command. But when I run postgres -v I get the error:</p>
  
  <p>The program 'postgres' is currently not installed. You can install it by typing:
  sudo apt-get install postgres-xc</p>
  
  <p>The other day i was trying to check if I have libxml2 but I had to chekck another way? perhaps the case is the same with this? im not sure...</p>