Answer
What browser is that? Use Chrome or Firefox.
Press F12 to open dev tools and pick Console tab - and make a screenshot for me please.
It looks like that
That's exactly what I wanted. It tells me what error and where to look.
I was able to fix it. Try now.
Please confirm does it work. If not - tell me if your Chrome version is up to date.
It seems your upgrade system doesn't work. Current version is 50 and there is no way it will run on Chrome 37 which is 2 years old. I am sorry but there is no way I can fix that - it doesn't support a lot of new things. You have to upgrade you Chrome (or the whole Ubuntu - 16 is really awesome :) )
Closing the topic as solved. Feel free to reopen it if the game still doesn't work after upgrade.
Customer support service by UserEcho
Closing the topic as solved. Feel free to reopen it if the game still doesn't work after upgrade.