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uninstall CND Look in Options: IDE Configuraion | System | Autoupdate Types The CND server is still present there. Should be removed
I was too hasty in assigning this to Marek (and making it an installer issue). I think the fix needs to be in the cnd module (probably CndModule.uninstalled).
Look at cnd/update/src/org/netbeans/modules/cnd/update/resources/autoupdate.settings There is a declaration that AU center provided by this settings file (istance DO) belongs to org.netbeans.modules.autoupdate/1 module. It should be org.netbeans.modules.cnd.update/1 Once you fix this it should work well - NB core (autoupdate) will ignore this settings file.
Even after changing the ownership of the settings file as suggested, the problem still persists; the NB core autoupdate is not ignoring the settings file. Transfering this bug to autoupdate category for further evaluation.
*** This issue has been marked as a duplicate of 72102 ***
With the fcs version of nb55 and c/c++ pack, i have verified that the behaviour is indeed correct. The c/c++ pack au center settings' ownership is correctly marked as org.netbeans.modules.cnd.update/1. And when c/c++ pack is uninstalled, the c/c++ pack update center does not appear any more in the au client.