I just started using duolingo on the computer (I've been using it for over a month on my phone and didn't know it had the web app, which is way better and richer!)
I noticed that the questions sometimes require that I speak through the microphone. My microphone works fine on Skype and Google Hangout, but when I tried saying the sentence it says something like didn't get what you said, try speaking slower. I tried speaking so slow like a whale, and also so loud, it didn't let me pass or skip that question.
I use Ubuntu latest LTS, is it a problem with the flash for the Chromium browser?