title: git push fatal error: The remote end hung up unexpectedly
body: <p>I have created a new branch in my local repository and after some commits, I wanted to push it to the remote repository.</p>
  
  <p><code>git push origin new_branch</code> </p>
  
  <p>The last month I did something similar (to push a new branch) and I never had a problem before, but now I have this error:    </p>
  
  <p><code>Counting objects: 39, done.<br>
  Delta compression using up to 2 threads.<br>
  Compressing objects: 100% (23/23), done.<br>
  Writing objects: 100% (23/23), 14.30 KiB, done.<br>
  Total 23 (delta 16), reused 0 (delta 0)<br>
  Unpacking objects: 100% (23/23), done.<br>
  fatal: Unable to create '/mnt/server.Annax/git/voipsrv_anxsvn/.git/refs/heads/new_branch.lock': Permission denied<br>
  fatal: The remote end hung up unexpectedly<br>
  fatal: The remote end hung up unexpectedly</code></p>
  
  <p>Can anybody help me, please?</p>