Login screen freezes

Question

I have upgraded from 16.04 to 16.10 and when it reboots it starts normal but once at log in it freezes. Can't use keyboard or mouse. Please help! To see what I'm really talking about... I made a video: https://www.youtube.com/watch?v=4g0TID-rJ8w&feature=share

Answer 1

This looks like a duplicate of this problem. The user here recommended booting from recovery and running the following as root:

mount -o rw,remount /
apt-get update
apt-get dist-upgrade
reboot

In addition, if this is a login issue it could be an issue with lightdm. To reconfigure and restart lightdm, type Ctrl+Alt+F1 to move into a terminal, login, and type

sudo dpkg-reconfigure lightdm
sudo service lightdm restart

to get back from terminal, type Ctrl+Alt+F7