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"The following upgrades have been deferred due to phasing:"

What exactly is deferred due to phasing? I'm seeing this when I update my Ubuntu machines. I've actually seen the same updates available but can't update any of them and it's been 3 days. If I can't update, just don't show me the update until I'm allowed to update. I'm sure there's a logical reason for this but I just don't see it.