Try to install skyline UI to replace horizon using doc: https://docs.openstack.org/skyline-apiserver/latest/install/docker-install-ubuntu.html 

Everything went well and I got a login page on http://x.x.x.x:9999 also it pulled Region/Domains. When I am trying to login with my account, I get an error: Username or Password is incorrect. 

I am using sqlite DB for skyline as per documents. 

No errors in logs command

$ docker logs skyline  

When I use Chrome Developer Tools then it was indicating an error in these URLs.