title: Switch raspbian to 64bit
body: <p>I switched my raspian to 64bit by adding <code>arm_64bit=1</code> to <code>/boot/config.txt</code>. It worked in that sense, that the kernel now is 64bit.</p>
  <p>When I want to install packages (docker in my case), I want to use it the 64bit version, but it installs the 32bit version. As it turns out, the package manager still is set to 32bit:</p>
  <pre><code>$ dpkg --print-architecture
  armhf
  </code></pre>
  <p>How can I make the package manager install 64bit packages?</p>