If you are attempting to run the ADL Workbench on 64 bit systems with MultiArch support you will need to setup support for the 32 bit libs and install them.
For example Ubuntu 14.04LTS, you will probably need to perform these steps:
sudo dpkg --add-architecture i386
sudo apt-get update
sudo apt-get install libc6:i386 libncurses5:i386 libstdc++6:i386
sudo apt-get install libgtk2.0-0:i386
Tom, you may want to add this to the installation instructions.
HTH,
Tim