title: Packages have unmet dependencies when installing mono-devel in Kali (Debian)
body: <p>I tried to install mono-devel and typed <code>sudo apt-get mono-devel</code> in the terminal. But failed and got the following results:</p>
  
  <pre><code>~# apt-get install mono-devel
  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:
  mono-devel : Depends: libgamin0 but it is not installable
            Depends: libgnomeui-0 (&gt;= 2.22.0) but it is not installable
            Depends: libmono-cil-dev (= 4.2.3.4-0xamarin2) but it is not going to be installed
            Recommends: mono-csharp-shell but it is not going to be installed
  E: Unable to correct problems, you have held broken packages.
  </code></pre>
  
  <p>I tried <code>apt-get -f install</code> but still not work. Could anyone help? Thanks!</p>