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Install bundle, start IDE, stop IDE. Then go to uninstaller and start uninstalling process. Uninstaller will report about running IDE. See attachment.
Created attachment 38741 [details] screenshot
Fixed. Now lock is searched only in the netbeans userdir defined in the specific etc/ netbeans.conf. The previous search in the entire ~/.netbeans directory has been removed. Please note that this lock can still exist if netbeans IDE was manually killed by user or just crashed. If the lock still exist after normal IDE exit then please file an issue against ide itself.
Uninstalled smoothly.