Why installing packages without updates fails? Are original packages removed from repositories after update is available?

view story

http://askubuntu.com – After a fresh 14.04.1 install I removed a few packages, disabled updates (because updating causes suspend/sleep not to work), ran apt-get update and apt-get upgrade (which of course printed 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.), and finally tried installing packages with apt-get, but I get this error message: Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may h (HowTos)