I can confirm that the Edgy mythtv 0.20 package works on Dapper. However, in order to build, a couple of new dependencies are added (libiec61883-0 and libraw1394-8)
If you want to try it out, I've got backports on my personal repository - "deb http://apebox.org/badgerexplosion ./" - note that there are no plugins available yet, as they haven't arrived in edgy (that said, the plugins package from debian-multimedia also builds fine against my mythtv backport) -- MythTV v0.19 https://launchpad.net/bugs/51680 -- ubuntu-backports mailing list ubuntu-backports@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-backports