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In Aptitude, how can I tell where a package is coming from? I've set up my apt sources.list and preferences files for pinning, but I just want to make sure I'm not unknowingly upgrading to packages from backports or unstable.

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closed as off topic by womble, Chopper3 Aug 1 '11 at 7:40

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apt-cache policy $packagename will tell you what you want to know. For example:

$ apt-cache policy gnucash
gnucash:
  Installed: 1:2.4.2-1ubuntu1
  Candidate: 1:2.4.2-1ubuntu1
  Version table:
 *** 1:2.4.2-1ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ natty/universe i386 Packages
        100 /var/lib/dpkg/status
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