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Compile step - java.io IOException: File is read-only

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I am trying to run the sample helloworld app on Ubuntu Linux 9.04

The first 6 steps work fine.  When I run step 7 it saves the new .prj file then I get a pop up window with the following message:

Cannot perform the requested operation due to java.io.

IOException: File is read-only

I suspect is due to my id not being root but what authorities do I need to set and how (step by step commands would be appreciated)?  Thanks in advance

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