I recently formatted my Ubuntu hard disk to install Kali on it. I formatted the entire hard disk through the Kali installation process.
Now, my pc boots to "GNU GRUB Version 2.02" with "grub>" command line.
Exiting this I managed to get to my boot manager, where I found that Ubuntu's grub was still in my Hard disk.

[As u can see it still sees 2 grubs](https://i.ibb.co/yqGQM3H/IMG-20190522-190810.jpg)

From here, I'm able to finally get to kali' grub and boot the OS. Choosing Ubuntu brings me back to the black "GNU GRUB Version 2.02" screen. 
I can use the computer like this, but it's a really annoying process.
Anyone has suggestions on what could I do to skip the whole process and repair my bootloader? Booting directly into kali at startup would be fine, since it's the only OS on my hd.