This issue no longer occurs in Cosmic. Installing graphviz now pulls in a 'libgts-0.7-5' package, so I assume that the fix that was made in the Debian package has found its way to Ubuntu.
This issue no longer occurs in Cosmic. Installing graphviz now pulls in a 'libgts-0.7-5' package, so I assume that the fix that was made in the Debian package has found its way to Ubuntu.