PPA doesn't build packages for Karmic

I'll need to look up how to work with PPAs for multiple releases, but it shouldn't be an issue. As you saw, the packages themselves should install just fine on Karmic.

Yeah, only now I have to manually download it each time instead of receiving the updates automatically through the package manager, because I get an error whenever I reload my repo's with the PPA enabled.

The guidance at https://help.launchpad.net/Packaging/PPA/Uploading#Using%20packages%20from%20other%20distributions for uploading the same source package to multiple distributions (i.e. jaunty and karmic) doesn't seem to be working for me. The easiest way forward will probably be to release a 0.5.3 this weekend that fixes an additional bug or two, and also happens to let me switch versioning schemes for PPA releases to use separate numbers for jaunty and karmic.

I've never used PPA for distribution myself, but as far as I know the "Using packages from other distributions" (linked above) has nothing to do with this problem. Rather, it's a question of packaging, specifically the changelog bit (https://wiki.ubuntu.com/PackagingGuide/Complete#changelog) wherein the dist is given.

Yeah, rereading that now, I see it's talking about uploading a source package from a different, non-Ubuntu, Debian-based distro (e.g. Debian unstable) and being able to manually tell it which Ubuntu suite (e.g. jaunty or karmic) to build it for. If you upload a source package that is for a particular Ubuntu suite, it'll use whatever's in changelog no matter what. That explains why the override wasn't working.