If, as you say, acpid is not required, then the init script or postinst script needs to be fixed so that the package installation does not fail if acpid is not installed. That is the issue that needs to be addressed.
If a package fails to install completely if a so-called non-required related package is not installed, then that's broken. I won't get involved in the upgrade/downgrade games, but the release managers decide what is release-critical or not. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]