title: Docker File does not exist:.. ,on Ubuntu
body: <p>I have an R plumber server, that i want to run using a docker container, and i have this configuration so far in my <code>dockerfile</code></p>
  
  <pre><code>FROM rocker/r-ver:3.5.0
  
  #update OS and install linux libraries needed to run plumber
  RUN apt-get update -qq &amp;&amp; apt-get install -y \
        libssl-dev \
        libcurl4-gnutls-dev
  
  #load in dependencies from 00_Libraries.R file
  RUN R -e "install.packages('plumber')"
  
  #Copy all files from current directory
  COPY / / 
  
  #Expose port :80 for traffic
  EXPOSE 80
  
  #when the container starts, start the runscript.R script
  ENTRYPOINT ["Rscript", "runscript.R"]
  </code></pre>
  
  <p>in my runscript.R file, i have my server configuration like this:</p>
  
  <pre><code>pr &lt;- plumber::plumb("/home/kristoffer/Desktop/plumber-api/rfiles/plumber.R")$run(port=8000)
  </code></pre>
  
  <p>whenever i try to run the docker image, i get this error:</p>
  
  <pre><code> File does not exist: /home/kristoffer/Desktop/plumber-api/rfiles/plumber.R
  Execution halted
  </code></pre>
  
  <p>i have ensured, that all the necessary files are located in the right directory.</p>
  
  <p><a href="https://i.stack.imgur.com/DvqAv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DvqAv.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/aMS1V.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aMS1V.png" alt="enter image description here"></a></p>
  
  <p>EDIT:
  i included an image of all the files i have in my directory, to ensure, that the dockerfile is in the same directory as my other files</p>