# apt-get install tightvnc-java

To confirm you have the correct version installed:

# dpkg --list | grep tightvnc-java
ii  tightvnc-java                              1.3.8-0+hubzero3           TightVNC java applet and command line progra

You should see a "+hubzeroXX" suffix on the version, where XX is some number. This version includes SSL connection support and extra support for resizing the VNC session and a simple client action protocol used by the HUBzero VNC server.

If the wrong version is installed be sure you have added the hubzero package repository to you APT configuration. You may need to run "apt-get update" to get an up to date index of hubzero packages. After updating try installing tightvnc-java again.