Cannot clone github repository
<p>Based on this guide:
<a href="https://github.com/cytoscape/cytoscape" rel="nofollow">https://github.com/cytoscape/cytoscape</a></p>

<p>I am running a script on Ubuntu that clones a set of github repositories:
<a href="https://github.com/cytoscape/cytoscape/blob/develop/cy.sh" rel="nofollow">https://github.com/cytoscape/cytoscape/blob/develop/cy.sh</a></p>

<p>It fails with:</p>

<pre><code>$ ./cy.sh init
Target directory = 
Cytoscape project will be cloned to: /home/user/projects/cytoscape
Cloning: parent (URI = git@github.com:cytoscape/cytoscape-parent.git)
Cloning into 'parent'...
Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
Could not clone remote repository: /home/user/projects/cytoscape
</code></pre>

<p>If I instead from command line do:</p>

<pre><code>git clone https://github.com/cytoscape/cytoscape-parent.git
</code></pre>

<p>it works.</p>

<p>on what systems does:</p>

<pre><code>git clone git@github.com:cytoscape/cytoscape-parent.git
</code></pre>

<p>work?</p>