I have a problem in Kali login. The black page, Oh, No! somthing is wrong.

I have installed Kali in four partitions
5 GB swap
17 GB / (root)
30 GB /home
2 GB /boot

I have recieved a message during last weeks, which I have no enough space in /root, just after login.

I guess my current problem is related to the previous message, no enough space, and that was due to the small space of /boot partition.

Now, I am glad to help me to solve the problem. How can I solve it? And, what will be the next solution for the partition?

Thank you all. Regards,