mythtv-backend .23 error

[pedplar]

Anyone else getting this error when trying to dist-upgrade?

Setting up mythtv-backend (0.23-0.1) ...
chown: invalid group: `mythtv:mythtv'
dpkg: error processing mythtv-backend (--configure):
subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
mythtv-backend
E: Sub-process /usr/bin/dpkg returned an error code (1)

[pedplar]

All the mds have the same problem.  The core went fine, no errors.