title: debian apt cant find openjdk-8-jdk
body: <p>im trying to install openjdk-8-jdk as suggested <a href="https://openjdk.java.net/install/" rel="nofollow noreferrer">here</a> with the command:</p>
  
  <pre><code>sudo apt-get install openjdk-8-jdk
  </code></pre>
  
  <p>but apt dosnt find the package. i did find it at <a href="https://packages.debian.org/de/sid/amd64/java/openjdk-8-jdk" rel="nofollow noreferrer">packages.debian.org</a> manualy and tried to tell apt to also load from there, as suggested on the <a href="https://packages.debian.org/de/sid/amd64/openjdk-8-jdk/download" rel="nofollow noreferrer">mirrors page</a> of that package by adding the following line to /etc/apt/sources.list</p>
  
  <pre><code>deb http://ftp.de.debian.org/debian sid main
  </code></pre>
  
  <p>but apt still cant find the package. i also tried to change the</p>
  
  <ul>
  <li>url to <a href="http://deb.debian.org/debian" rel="nofollow noreferrer">http://deb.debian.org/debian</a></li>
  <li>sid to buster or buster-backports </li>
  <li>main to unstable, non-free, contrib (or a list of some or all of those)</li>
  <li>combinations of all of the above</li>
  </ul>
  
  <p>still no luck.</p>