I participate in a virtual class which the basic software is Adobe Connect. I installed Adobe by software center and then try to connect got this message. and I tried to remove it and installed the Adobe flash player plugin by adobe website, also other websites was Ok but I have same problem in connecting to my V class. When I was using Ubuntu 12.04 I didn't have same problem. What's your suggestion ?
You can go and download Google Chrome from https://www.google.com/intl/en/chrome/browser/
It has built in versions of Adobe products.
Chromium and Firefox still use the Adobe Flash plugin that you install and it doesn't always work right I have found.
If you have Google Chrome installed then just uninstall all the adobe products you installed.
Chrome is shipping with a built-in Flash plugin. Even if you install manually Flash it will always use the version it's shipped with and also Adobe Connect won't open Connect Add-In.
Refer to the official Adobe Connect help site how to solve the problem: http://helpx.adobe.com/adobe-connect/kb/google-chrome-browser-incompatibility-version.html