Kernel changed to Kali Rolling Linux

Good day Ubuntu family, I was trying to do a sudo apt-get upgrade yesterday on my system, and the upgrade wasninterrupted and I had to restart my system, upon restarting I was unable to boot into Ubuntu again. So I switched over to console from the blank screen and resumed the upgrade, when the upgrade was completed I then restarted my pc with hope that it should be back to live, to my surprise in grub load I saw Kali Linux keel. How is this even possible and still am unable to login into Ubuntu still stuck at a blank screen. Please help have got lot of stuff on my pc