Can't login Unity on Ubuntu 16.04 LTS

I found an built of Unity3d for Ubuntu 64 bit. I downloaded it and install it :

After open Unity, I can’t login, it says “Service is not available, try again later”. I try to open on Fluxbox, i3, … with root. And nothing happen. Is that Unity server prevent login from Ubuntu ?

@tranminhchien @csfinch Had the same problem. I upgrated to unity 5.4 and everything is just fine . Solution found on thread

I’m wondering about the same issue. I thought I might be under a proxy, but when I made sure I wasn’t and still couldn’t login I was really ticked off.