Do a new install and start up JBDS. Choose Help -> Software Updates and then click the Update button. Answer Yes to the question "The software items you selected may not be valid with your current installation. Do you want to open the wizard anyway to review the selections?". Then you'll see a rather long list of available updates with each one as far as I can tell having the same message:

Cannot complete the request. See the details.
Cannot find a solution satisfying the following requirements org.eclipse.ui.ide.application [1.0.101.M20090826-0800].