Good uninstallation practice?

[Émeric Maschino]

Hi,

What's the correct way to manually uninstall a package that failed to
uninstall during an update? For example, during the update of
hal-cups-utils with today's Rawhide, I'm getting:

   Cleanup   : hal-cups-utils               #####################
[224/257]
error: %postun(hal-cups-utils-0.5.5-2.ia64) scriptlet failed, exit
status 1

I now have hal-cups-utils-0.5.5-2 and hal-cups-utils-0.6.0-1 installed
on my system and would like to uninstall the old one.

Thanks,

	Émeric