Update Manager offers 900+ updates under partial upgrade mode

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http://askubuntu.com – Today I checked for updates and got an error message telling me I must do a partial upgrade. I was shocked to see how many updates there were available. 900+ Updates! By using synaptic I found out that it wanted to remove core packages from my system, such as compiz and python, but also update some as well. I am very confused why package manager would want to do this all of a sudden, and why it wants to destroy my system. I really need an answer, because I now cannot update my system. (HowTos)