title: Unable to install postgresql on oracle linux with yum
body: <p>When i try to install the package it says package is already installed, But when i try to install then it says that no package is available.</p>
  
  <pre><code>Downloads $ sudo rpm -i pgdg-oraclelinux91-9.1-7.noarch.rpm
  package pgdg-oraclelinux91-9.1-7.noarch is already installed
  
  Downloads $ sudo yum -y install postgresql91 postgresql91-contrib postgresql91-devel postgresql91-libs postgresql91-plperl postgresql91-plpython postgresql91-pltcl postgresql91-docs postgresql91-server
  Loaded plugins: langpacks, ulninfo
  Repository google-chrome is listed more than once in the configuration
  No package postgresql91 available.
  No package postgresql91-contrib available.
  No package postgresql91-devel available.
  No package postgresql91-libs available.
  No package postgresql91-plperl available.
  No package postgresql91-plpython available.
  No package postgresql91-pltcl available.
  No package postgresql91-docs available.
  No package postgresql91-server available.
  Error: Nothing to do
  </code></pre>
  
  <p>Thanks in Advance.</p>