Linux Mint 19 - Looping of login screen

Problem:

   After the login, the screen gets black, and then you get the login screen again.

My solution:

   Press [ctrl][alt][F3] to jump to a terminal
   Login with your credentials
   Digit ls -lha and take note of permission of .Xautority
   Note that the permission is like this:
      -rw------- 1 root root 53 Jul 02 20:19 .Xauthority
   Digit chown myuser:myuser .Xauthority (where myuser is your user name)
   Now the permission is changed like the following:
      -rw------- 1 myuser myuser 53 Jul 02 20:19 .Xauthority 
   Press [ctrl][alt][F7] to jump to the graphical login screen

Try to login.