Comment 9 for bug 1353353

The library "libvncclient" was split out of the package "libvncserver0" at version "libvncserver_0.9.9+dfsg-5ubuntu1". The package "remmina-plugin-vnc" that you, and I (Trusty), are using was built on the previous version of "libvncserver0" that being "libvncserver_0.9.9+dfsg-1ubuntu1.3" (last one before the split). This version included "libvncclient.so.0.0.0" and linked to from "libvncclient.so.0".

If you wanted to use a later version of "libvncserver", like say "libvncserver0_0.9.9+dfsg-6ubuntu1.1" then you'll also need to install the package "libvncclient0_0.9.9+dfsg-6ubuntu1.1".