The Ubuntu Trusty package is still at 0.15.10 [1], while 0.16.2 was already packaged for e.g. Debian Jessie [2].
[1]: http://xpra.org/dists/trusty/main/binary-amd64/ [2]: http://xpra.org/dists/jessie/main/binary-amd64/
Trusty will not be receiving 0.16 onwards because of its use of libav: http://lists.devloop.org.uk/pipermail/shifter-users/2015-December/001460.html. I probably should not have updated Jessie either. But what is done is done.
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/1128