Comment 5 for bug 1022407

Usable packages for PK 0.8.x are now available in Debian Experimental. I'll very soon assemble the whole family of PackageKit-related apps there and then push everything to unstable, as soon as it is ready. (But because Debian is at freeze at time and I don't want to annoy people who depend on PackageKit and want to contribute packages to testing via unstable, I'll wait with this for some time)
You can take the packages for Ubuntu R*