Displaying the source of a package

[Anthony M Simonelli]

When the desktop in Ubuntu is installed, Synaptic is a real useful tool
to add and remove packages.  It also lets you check the packages origin
(main, universe, multiverse, etc.)  I have a server install and don't
have a GUI installed so is there a way to do that with apt-cache or
aptitude on the command line?

Basically, I want to know about all packages that are NOT installed from
"main".
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