These are the steps I had to take to establish a connection from within NetBeans 6.7 to my Subversion Repository via a https connection.
Install svn -> sudo apt-get install svn
Install an svn client, I chose RapidSVN -> sudo apt-get install rapidsvn
In NetBeans select Team ＞ SVN＞Check out… and fill in the Form. The path to the RapidSVN executable is /usr/sbin.
Restart NetBeans and you should be able to proceed in the wizard.