Re: use of "invoke-rc.d $PACKAGE stop || exit $?" in prerm scripts
Francesco P. Lovergine writes ("Re: use of "invoke-rc.d $PACKAGE stop || exit $?" in prerm scripts"):
> Unfortunately sometimes the daemon does not stop for an error in the
> maintainer script and that prevents upgrading for ever, even when
> the package has been corrected. [...]
If the old package's prerm fails, dpkg tries the version from the new
package instead, precisely to avoid this problem. See the policy
manual for details.