title: Maven integration for Eclipse cannot be installed
body: <p>I tried to install Maven Integration for Eclipse from Eclipse Market Place. </p>
  
  <p>I had to cancel the installation in the mid because it took a long time. </p>
  
  <p>I tried the installation after restarting the Eclipse, now I cannot find the "<code>Install</code>" button, instead there is an "<code>Update</code>" button which is disabled. (see the screen shot).</p>
  
  <p>I tried un-installing and re-installing, but no success.</p>
  
  <p>I am using Eclipse Indigo on my Ubuntu 12.04 LTS.</p>
  
  <p><img src="https://i.stack.imgur.com/LKGkd.png" alt="enter image description here"></p>