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If you uninstall previously installed netbeans IDE, the installer fails when you trying to install again. This can have a connection with this bug: http://www.netbeans.org/issues/show_bug.cgi?id=105165
Created attachment 43033 [details] Installer error
Created attachment 43034 [details] nbi log dump
The issue is that the ~/.nbi/registry.xml file is empty. This issue is already known. *** This issue has been marked as a duplicate of 103003 ***