I have a raspberry pi installed with debian 10 operating system. When I tried using the GUI login, it was asking for username and password again and again in loops.
The password was correct and there was not error messages on the screen. I even tried changing my password to a new one without any special characters to check whether it was related to the locale of my keyboard. But it did not help.
Finally I solved the problem by installing the following package and rebooting the Pi.
sudo apt-get install lxsession
Hope this helps someone. 🙂
All About Tech 
Thank you so much! This really helped save me a lot of time I had already spent more than enough.
Thank you for the comment. Happy to hear that this was helpful 🙂
excellent!!!! Many thanx….you solved my issue.
Read many forums and tried multiple things with no luck
Thank you for the comment. Happy to hear that this was helpful 🙂
Thanks! This indeed helped me. But I had turned on auto-login to GUI in the config, so I hope this little keyboard shortcut to get TO the command line from the login window helps someone else:
ctrl-alt-F1
Hey Amal, thank you very much. You safed my ass. After hours I landed here and got the solution. Where can I spend you a coffee or beer?
Thank you for your comment. Happy to hear that my tip is helpful.
Hey Amal, Thank you so much for this. I was up late hours trying to find a answer to this mess
Happy to hear that this tip helped you. 🙂
perfect, thanks!
+1 thanks
Happy to know that the tip was useful 🙂
Thank you guys! I was having a lot of trouble getting a pi to work. But between the key strokes: ctrl+alt+f1 and this article you all have made my day!