This is the package that will be in the newest Ubuntu release.
Another option is to have users install from this ppa: https://launchpad.net/~gmpc-trunk/+archive/mpd-trunk/+packages
Another option is to request a backport in Ubuntu: https://wiki.ubuntu.com/UbuntuBackports
However, I think it makes sense to migrate features that require >0.16.5 mpd to the groove basin backend, since that's the direction we want to go anyway.
Better solution yet, don't support mpd at all!! hurray!