I pushed all the traffic through a proxy again so I could look at update-manager's URLs (is there an easier way to this? Should I just hack up the source?) and what I found was that of 38 files requested only one was actually there (hpijs)! All the rest of the URLs returned 404. This is extremely strange as synaptic is able to find pretty much all of the other changelogs apart from hpijs...
I pushed all the traffic through a proxy again so I could look at update-manager's URLs (is there an easier way to this? Should I just hack up the source?) and what I found was that of 38 files requested only one was actually there (hpijs)! All the rest of the URLs returned 404. This is extremely strange as synaptic is able to find pretty much all of the other changelogs apart from hpijs...