title: Ubuntu - Unable to correct problems, you have held broken packages
body: <p>I've searched the solution but so far I did not get the right one I can apply.</p>
  
  <p>Host: Ubuntu 14.04</p>
  
  <p>when I typed the following command,</p>
  
  <pre><code>sudo apt-get install libxtst-dev:i386
  </code></pre>
  
  <p>I got the following error message:</p>
  
  <pre><code>Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:
  
  The following packages have unmet dependencies:
  libxtst-dev:i386 : Depends: libxext-dev:i386 but it is not going to be installed
                  Depends: libxi-dev:i386 but it is not going to be installed
  E: Unable to correct problems, you have held broken packages.
  </code></pre>
  
  <p>And some other packages the same error.</p>
  
  <p>Please let me know how to resolve these conflicts, theanks.</p>