WebEx desktop sharing on 64-bit Ubuntu

After much trial and error, I was able to get WebEx desktop sharing working in 64-bit Ubuntu just by installing a few packages:

Remove unnecessary packages that cause conflicts:

sudo apt remove icedtea-7-plugin:i386 icedtea-8-plugin:i386 icedtea-netx:i386

Install 32-bit Java, a necessary 32-bit library, the Java plugin, and Firefox:

Ubuntu 14.10+

sudo apt install openjdk-8-jre:i386 libxmu6:i386 icedtea-8-plugin firefox

Ubuntu 14.04 and below

sudo apt-get install openjdk-7-jre:i386 libxmu6:i386 icedtea-7-plugin firefox

Make sure the correct Java plugin is configured:

Ubuntu 14.10+

sudo update-alternatives --set mozilla-javaplugin.so /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so

Ubuntu 14.04 and below

sudo update-alternatives --set mozilla-javaplugin.so /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so

Close and re-open Firefox, and WebEx desktop sharing should work.

You must use Firefox. WebEx will not work on Google Chrome as Chrome for Linux no longer works with Java.
If you don't remove and install the exact packages listed above, WebEx will work, but desktop sharing will not work.

Thanks bmaupin! For me this also works on a freshly installed 64-bit Ubuntu 16.04 (no upgrade from older Ubuntu)

Enabled 32-bit support (see also: http://www.unixmen.com/enable-32-bit-support-64-bit-ubuntu-13-10-greater/):

    sudo dpkg --add-architecture i386
    sudo apt-get update
    sudo apt-get upgrade

Installed openjdk and required plugins for Firefox

    sudo apt-get -y install openjdk-8-jre:i386 libxmu6:i386 icedtea-8-plugin

Set correct Java plugin for Firefox

    sudo update-alternatives --set mozilla-javaplugin.so /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so

Run WebEx

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