title: dpkg error when installing JDK7 on Ubuntu12.04
body: <p><strong>Error message from terminal:</strong></p>
  
  <blockquote>
    <p>Download done.
    sha256sum mismatch jdk-7u3-linux-i586.tar.gz
    Oracle JDK 7 is NOT installed.
    dpkg: error processing oracle-java7-installer (--configure):
     subprocess installed post-installation script returned error exit status 1
    Errors were encountered while processing:
     oracle-java7-installer</p>
  </blockquote>
  
  <p><strong>Install steps:</strong></p>
  
  <p><code>sudo add-apt-repository ppa:eugenesan/java</code></p>
  
  <p><code>sudo apt-get update</code></p>
  
  <p><code>sudo apt-get install oracle-java7-installer</code></p>
  
  <p>Could you give me some suggestions how to solve the problem?</p>