title: docker: executable file not found in $PATH": unknown
body: <p>Using AWS instance based on ubuntu 18.04, Docker version 19.03.10, build 9424aeaee9.
  I got the following error: </p>
  
  <pre><code>docker: Error response from daemon: OCI runtime create failed: container_linux.go:345: starting container process caused "exec: \"python\": executable file not found in $PATH": unknown.
  </code></pre>
  
  <p>after trying to execute the code: </p>
  
  <pre><code>docker run --name test1 c73eada5a5fa
  </code></pre>
  
  <p>where "c73eada5a5fa" is my container id after being built using:</p>
  
  <pre><code>sudo docker build -t my_username/repository .
  </code></pre>
  
  <p>Here is my docker:</p>
  
  <pre><code>FROM ubuntu:18.04
  COPY . /PFE_exec
  CMD ["make", "PFE_exec"]
  CMD ["sudo","apt","install","unzip"]
  CMD ["echo","requirements installed!"]
  CMD ["unzip","home/ubuntu/PFE/aa.zip"]
  CMD ["python","home/ubuntu/PFE/test.py"]
  CMD ["python","home/ubuntu/PFE/test2.py"]
  CMD ["python","home/ubuntu/PFE/test3.py"]
  </code></pre>
  
  <p>Using python3 instead of python doesn't resolve the problem as well.
  I don't understand where is the problem.
  Any help?
  Thank you in advance!</p>