login failure after apt-get dist-upgrade

[zdt]

I just did apt-get dist-upgrade, seems the upgrade process went well, and it brought up the GRUB memu at the end, I choosed the 3.18.0-kali3-amd64 option to boot, it brought up the login GUI shortly, after I entered the root as user name and my password, it does not allow me to log in, saying "sorry, it does not work, please try again". well, I tried to use ssh to log into the machine within my home network, I'm able to log into the system as root by entering the password without problem.

I think the problem may be related to the upgrade/installation process, somewhere I did not select the correct option. Does any one know how to fix the login problem?

Note, after the dist-upgrade, it shows it upgraded to debian 8.

Thanks a lot for help.
Dave

[g0tmi1k]

Note, after the dist-upgrade, it shows it upgraded to debian 8.

This means you or a script that you have ran has altered the repos and your now using the development values.
You will need to do a fresh install to recover now.

[zdt]

as I'm able to log into the machine as root through ssh, meaning, I can do anything as normal as root's right. I'm just wondering, by any chance, is there a way to get GUI login problem fixed in stead of a fresh install.