Ubuntu – Webex on Ubuntu 16.04

I'm trying to get Webext to work. I read this http://www.linuxintro.org/wiki/Use_WebEx_with_Linux
which tells me to check for missing dependencies via
ldd *.so | grep "not found"

It gives me this list:

~$ ldd .webex/1524/*.so | grep "not found"
    libgtk-x11-2.0.so.0 => not found
    libgdk-x11-2.0.so.0 => not found
    libXmu.so.6 => not found
    libXtst.so.6 => not found
    libstdc++.so.6 => not found
    libXt.so.6 => not found
    libXi.so.6 => not found
    libstdc++.so.6 => not found
    libstdc++.so.6 => not found
    libstdc++.so.6 => not found
    libjawt.so => not found
    libasound.so.2 => not found
    libstdc++.so.6 => not found
    libstdc++.so.6 => not found
    libjawt.so => not found
    libXmu.so.6 => not found
    libstdc++.so.6 => not found
    libstdc++.so.6 => not found
    libstdc++.so.6 => not found
    libuuid.so.1 => not found
    libstdc++.so.6 => not found
    libstdc++.so.6 => not found
    libstdc++.so.6 => not found
    libstdc++.so.6 => not found
    libstdc++.so.6 => not found

But if I try to install these 'missing' dependencies I am informed that they are already at latest version. E.g.

~$ sudo apt-get install libgtk2.0-0
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libgtk2.0-0 is already the newest version (2.24.30-1ubuntu1).
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.

So don't know how to get this going. Anyone have webex working?