title: Git flow track - already exists
body: <p>I am learning GIT (with Git Flow) and I know its not good to use StackOverflow instead of a book.</p>
  
  <p>I am involved in a project. There are two feature  branches named F1 and F2 maintained by groups G1 and G2. Assume F1 depends on F2 and G1 has <code>published</code> its branch using <code>git flow feature publish F1</code>.</p>
  
  <p>Now G2 needs to track F1 and well may be do a re-base on top of F1 from time to time. For this I red that we need to use <code>git flow track</code></p>
  
  <p>So I (of G2) used some thing like this</p>
  
  <pre><code>git flow feature checkout F2
  git flow feature track F1
  </code></pre>
  
  <p>But Git is saying the following:</p>
  
  <pre><code>Branch 'feature/F1' already exists. Pick another name.
  </code></pre>
  
  <p>Then I tried a name that didn't and hoped it will at some point ask me for the branch that needs to be tracked. But then I got this message.</p>
  
  <pre><code>git flow feature track F1_track
  Branch 'origin/feature/F1_track' does not exist and is required.
  </code></pre>
  
  <p>Am I doing some thing silly? Could it be an issue with my installation? </p>
  
  <p>I believe you understand what I am trying to do, could you please help me out in the issue.</p>