I was running Kali Linux 2.0 Sansa. I did the Kali Linux
apt-get update && apt-get upgrade
To upgrade to Kali 2.0 rolling edition now I cannot log in The user name and password still work because if I do Ctrl+alt+f3. They work on the command line.
But in GUI it just loop over and over, keeps on asking for user name and password.
One thing you can try is rule out the useraccount settings as a cause. Since those are generally stored in your home director (/home/you), the fastest way would be to login on another screen, make yourself root, mv your original home directory to another name (mv /home/you /home/you.old) and recreate your home directory (mkdir /home/you ; cp -r /etc/skel /home/you ; chown -R you:you /home/you ). Another possibility would be to create another new user and try that.
