Update on 2015-07-04: GNU/Debian users may follow a different path - there is now a package called pepperflashplugin-nonfree, which automates and bundles my tutorial into one small script. Not done by me, so kudos to whoever created it! ;)
Displaying posts tagged: pepperflash
Editing /usr/lib/chromium-browser/default and adding the ppapi string didnt help (see respesctive Thread @ ubuntuforums.org).