See flashy "Upgrade LTS to LTS - Dapper to Hardy".
Visit Synaptic & (attempt) to set repositories to Hardy.
What? After seeing the flashy message in Update Manager, you leave it for Synaptic??
You're doing it wrong!
I have yet to see any problem, however complicated, which, when you looked at it in the right way, did not become still more complicated. -- Poul Anderson