On Thu, Jan 26, 2012 at 01:49:54AM -0000, Thomas Bushnell, BSG wrote:
> For this to work reliably in a cross-version lucid->precise upgrade,
> however, won't you need to push a new libwmf0.2-7 package in lucid that
> fixes its prerm?

No, because dpkg will fall back to the new prerm (i.e. the one in the
package it's upgrading to).  This is a very useful get-out clause.  It
does require libwmf0.2-7 in precise to ship a no-op prerm rather than no
prerm at all, which is a little surprising, but otherwise it works.

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https://bugs.launchpad.net/bugs/901741

Title:
  perl-modules lucid->precise upgrade failure: debsums needs to restrict
  itself to Essential dependencies

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