title: Error after typing a command to clear npm cache ```sudo npm cache clean -f```
body: <p>I'm currently using Linux mint:
  After running <code>sudo npm cache clean -f</code> in terminal, I have now a problem with the npm cache. here is the text Error:</p>
  
  <pre><code>npm ERR! syscall open
  npm ERR! path /home/mint/.npm/_cacache/tmp/15c7b348
  npm ERR! errno -13
  npm ERR! 
  npm ERR! Your cache folder contains root-owned files, due to a bug in
  npm ERR! previous versions of npm which has since been addressed.
  npm ERR! 
  npm ERR! To permanently fix this problem, please run:
  npm ERR!   sudo chown -R 999:999 "/home/mint/.npm"
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     /home/mint/.npm/_logs/2019-11-25T05_52_58_726Z-debug.log
  </code></pre>
  
  <p>Can someone help me to fix this problem ? Even with the solution proposed in terminal, I don't know how to handle it.
  Thank you !</p>