I just did a fresh install of Xubuntu 18.04 on my new ASUS laptop with NVIDIA GeForce GTX 1050 graphics card, alongside my Windows 10 partition. I shrunk the factory C: partition by 200gb, deactivated Secure Boot, and then installed Xubuntu alongside the Windows Boot Loader from a USB key.
Everything seems to work normally...I see grub, then boot to ubuntu and I see the Xubuntu screen pop up beautifully, then the login screen. I login successfully, then the screen goes blank (pleasing light blue color). Mouse disappears, top panel disappears, and I am forced to press the power button to get out of it.
Edit: If login to Xubuntu in text mode and type
startxfce4 I get
/usr/bin/startxfce4: starting X server
waiting for X server to begin accepting connections
It goes on this way forever.....