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How can I know the source ppa of an installed package?

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linux-howto

http://askubuntu.com – I have a package (xserver-xorg-video-intel) from ppa sources. Since I have more than one ppa sources for this package in my package management I am not sure which one is the source. So I wonder if I can learn this using apt-get or dbpkg etc. Related question: If I have various ppa's for a given package, will apt-get change the ppa if it finds a new version of the package in any ppa? I am asking since I use an alternative ppa for xserver-xorg-video-intel as the driver in the official one leads to errors in hibernate/sleep. (HowTos)