title: dpkg : how to ignore error in post/pre scripts
body: <p>I've develop debian packages and have syntax mistake in my post/pre script (postrm in my case). I install package successfully, but now i can't remove this package :</p>
  
  <pre><code>/var/lib/dpkg/info/blablabla.postrm: 11: Syntax error: ";;" unexpected
  dpkg: error processing blablabla (--remove):
   subprocess installed post-removal script returned error exit status 2
  </code></pre>
  
  <p>How can ignore it and completely remove package?</p>