If you've changed anything to your sources.list recently, undo it. Inconsistent package error could be from you removing something that other things depended on.
"sudo aptitude update && sudo aptitude full-upgrade" should clean stuff up unless you've really made a mess of your system. If that gives you a bunch of errors, you're in a bit more trouble. If it goes successfully, you should be able to grab the flash player from Restricted Extras in Synaptic or Add/Remove, or try this script to install Flash.
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WAR IS PEACE
FREEDOM IS SLAVERY
IGNORANCE IS STRENGTH