I am on Netbeans Beta 2 for Linux.
I did:
1) Go to Tools> Plugins , and you should click Available Plugins that you will find: Git . Check this. Install it.
2) Then right click on your project properties, select: version> source git repository
In the tutorial you mentioned, everything: http://netbeans.org/kb/docs/ide/git.html
Perhaps this is a temporary problem?
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