This is because update-manager is not offering to install updates that are not completely phased, see further (http://www.murraytwins.com/blog/?p=127), but update-notifier does not take into consideration updates that are currently undergoing phasing.
This is because update-manager is not offering to install updates that are not completely phased, see further (http:// www.murraytwins .com/blog/ ?p=127), but update-notifier does not take into consideration updates that are currently undergoing phasing.