title: How to allow to create a directory in home folder another user
body: <p>I have two users: </p>
  
  <pre><code>adduser user1
  adduser user2
  </code></pre>
  
  <p>I need to allow creating folders in user2 home directory by user1</p>
  
  <pre><code>user2@ubuntu: mkdir /home/user1/tmp
  </code></pre>
  
  <p>How can I do that? Bacause now I get the error message: </p>
  
  <pre><code>mkdir "/home/user1/tmp" failed: Permission denied
  </code></pre>