The package is severely out of date with respect to the Debian
Policy. Latest version is 4.6.2
and your package only follows
3.9.8...
There were override disparities found in suite unstable:
unhtml: Override says text - optional, .deb says text - extra
This package has been
orphaned. This means that it does not have a real
maintainer at the moment. Please consider adopting this package
if you are interested in it.
Please see bug number
#1015847 for more information.