On the Ubuntu Forums there was information that Chromium learned to cling to the Adobe Flash Plugin. To install, it is enough to make a symbolic link to the installed library:
$ cd /usr/lib/chromium-browser/plugins $ sudo ln -s /usr/lib/firefox/plugins/flashplugin-alternative.so
To make it all work in the last build, use your browser to launch it (thanks, SerJook !)
$ chromium-browser --enable-plugins
At the moment, both sound and video are working normally. ')
Screenshot: