Why is my system freezing when I switch users

I fixed the problem but I'm not sure what caused it.

I renamed /var/lib/lightdm/.Xauthority to /var/lib/lightdm/.Xauthority-bak I did the same thing in my home directory.

sudo mv /var/lib/lightdm/.Xauthority /var/lib/lightdm/.Xauthority-bak
mv ~/.Xauthority ~/.Xauthority-bak

Then I restarted lightdm

sudo service lightdm stop
sudo service lightdm start

Works fine now. One of the files was corrupted, but I'm not sure which one fixed it.

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