Ubuntu 16.04 - GUI freezes on login start page

We were able to solve it by starting the shell in secure mode and executing the following commands.

  apt-get update 
  apt-get install xserver-xorg-input-all
  apt-get install ubuntu-desktop
  apt-get install ubuntu-minimal
  apt-get install xorg xserver-xorg
  apt-get install xserver-xorg-input-evdev    //I think this packet was the problem
  apt-get install xserver-xorg-video-vmware

  reboot

To Simplify @Black's answer, run these as root:

apt-get update
apt-get install xserver-xorg-input-evdev
/etc/init.d/lightdm restart

No reboot required on this solution.

I tried everything, for weeks, all day long. I finally went to Driver Manager and changed my video driver to NVIDIA, and that fixed it.

Ironically, NVIDIA was the recommended setting. No idea why that wasn't chosen. It wasn't me - Linux set that.

Anyway, let me know. YMMV.