Package Pinning in Linux

http://jaqque.sbih.org/kplug/apt-pinning.html

http://www.howtoforge.com/a-short-introduction-to-apt-pinning

https://help.ubuntu.com/community/PinningHowto

http://www.debian.org/doc/manuals/apt-howto/ch-apt-get.en.html

http://serverfault.com/questions/17046/preventing-specific-packages-from-getting-installed-in-debian