None of the ubuntu distro metadata reports support for the USB tablet device. To fill it in, someone needs to do a test and find the earliest version that supports it (probably debian jessie timeframe). Presently this prevents virt-manager from using a USB tablet for ubuntu VMs
Debian Squeeze already has support to USB Tablet according to libosinfo and it dates from 2011. Most likely 11.04 or 11.10 are the ones where the support was introduced. I'll take a look on this over the weekend, Cole.
Thanks Fabiano! I looked at the debian metadata in osinfo-db but messed up the debian codename, squeeze is correct
Patch sent to the ML: https://www.redhat.com/archives/libosinfo/2017-February/msg00017.html
Patch is part of 20170225 release.
osinfo-db-20170225-1.fc25 has been submitted as an update to Fedora 25. https://bodhi.fedoraproject.org/updates/FEDORA-2017-dacf05af1a
osinfo-db-20170225-1.fc25 has been pushed to the Fedora 25 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-dacf05af1a
osinfo-db-20170225-1.fc25 has been pushed to the Fedora 25 stable repository. If problems still persist, please make note of it in this bug report.