Public bug reported:

Binary package hint: apt

I'm not sure if this is a problem with the documentation, or a problem
with the application, however apt is not behaving as expected when
pinning negative values.

According to man 5 apt_preferences, a Pin-Priority "P < 0 prevents the
version from being installed."

Now I'll take a package at random and pin it in /etc/apt/preferences:
Package: python-tcm
Pin: version 0.5.1-0ubuntu4
Pin-Priority: -100

And yet, the package attempts to install:

[EMAIL PROTECTED]:/tmp# apt-get -Vs install python-tcm
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
   pessulus (2.16.3-0ubuntu1)
   python-tcm (0.5.1-0ubuntu4)
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Inst python-tcm (0.5.1-0ubuntu4 Ubuntu:7.10/gutsy)
Conf python-tcm (0.5.1-0ubuntu4 Ubuntu:7.10/gutsy)

The same occurs with a generalized version (Pin: version *).

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

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pinning negative preferences not preventing installation
https://bugs.launchpad.net/bugs/185692
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