I haven't looked into this bug at all, but I found something in the
manpage of apt_preferences that could be related to this behavior:
· If two or more versions have the same priority and version
number but either the packages differ in some of their
meta- data or the --reinstall option is given, install the
uninstalled one.
IMHO this means that if you somehow got two different packages with
the same name and version number into your cache you will see
a similar behavior as described in the bug reports.
Again, I don't know if that has anything to do with the problem
described in the bug reports (other then resulting in the same
symptoms), as I haven't had time to have a closer look at the
problem.
Cheers,
Christian
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