Good to see that you are using Linux. I am too. Ubuntu, Zorin OS (based on Ubuntu) and Solus OS.
Sometimes the dtube videos don't work for me and most of the time they do. I think it has something to do with the network or the time the videos are uploaded. Let me know if you find out more.
That's true, video did not work for me at work (same Xubuntu and chrome) and then here at home it worked just fine. I guess it was network issue.