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The usual thing is at least recompile all your packages (the ones that didn't ship with electric) to check if some dependencies are broken (most of the time they will be as message definitions are moved around). If no everything works fine and you are comfortable with the new distribution, you can safely remove diamondback. Unless you compiled ROS from source you should use the package manager of your distribution. In any case avoid manually deleting the files, always try to use the package manager.