title: Ubuntu 20.04 Dockerfile getting a E: Unable to locate package yum error
body: <p>My goal is to run this from a Dockerfile (which is basically setting up an Oracle client):</p>
  <pre><code>RUN  yum -y install /tmp/oracle-instantclient*.rpm &amp;&amp; \
       rm -rf /var/cache/yum &amp;&amp; \
       rm -f /tmp/oracle-instantclient*.rpm &amp;&amp; \
       echo /usr/lib/oracle/12.2/client64/lib &gt; /etc/ld.so.conf.d/oracle-instantclient12.2.conf &amp;&amp; \
       ldconfig
  </code></pre>
  <p>The problem is - I do not seem to have access to &quot;yum&quot;. As of result, I try to add it as seen below.</p>
  <pre><code>FROM ubuntu:20.04
  
  ENV DEBIAN_FRONTEND=noninteractive
  
  RUN apt-get update
  RUN apt-get upgrade -y
  RUN apt-get install -y python3-pip
  
  RUN apt-get -y install curl
  # Pick up some Python3 dependencies.
  RUN apt-get update &amp;&amp; apt-get install -y --no-install-recommends \
          build-essential \
          curl \
          yum \                   &lt;------ Having a problem with &quot;yum&quot;
          libfreetype6-dev \
          libpng-dev \
  
  [... snip ...]
  </code></pre>
  <p>When running docker-compose build, I get the following error:
  E: Unable to locate package yum</p>
  <p>It seems like yum was in earlier versions of Ubuntu (ex: Ubuntu 16) but it is not in Ubuntu 20(?) - or - am I missing something. If yum is not in Ubuntu 20, how can it be added?</p>
  <p>TIA</p>