title: R force reinstall packages
body: <p>I ran the command <code>update.packages(checkBuilt = TRUE, ask = FALSE)</code>.</p>
  
  <p>However my html directories were not writable and I got a lot of:</p>
  
  <pre><code>Warning in file.create(f.tg) :
  cannot create file '/usr/share/doc/R-3.0.1/html/packages.html', reason 'Permission denied'
  </code></pre>
  
  <p>Is there a way to force reinstall all packages now that I've fixed my permissions issues, so I get those HTML files? The code part got installed correctly, so <code>update.packages</code> doesn't work anymore. </p>