Cannot login - Service not available

Just installed Unity on Ubuntu 16.04 (Unity).
Cannot login. I can type my email&pass but after clicking “Sign In” button I get red header which says"
“Service not available, please try again later”

PS. Is there some kind of log file?

False alarms.
Downloaded newest package and it’s working properly
5.4.0b21:
http://download.unity3d.com/download_unity/linux/unity-editor-5.4.0b21+20160609_amd64.deb