So recently I wanted to install Kali Linux to use alongside windows 10 as a dual boot system, I have used ubuntu in the pased so I uninstalled it before doing anything else even though the Grub boot loader for it is still present (also yes, I have tried removing the grub boot loader in admin win 10 cmd but it says something around the lines of "this can't be done on removeable media) the drive where I install kali on is my sub thumb drive because it's convenient for me, I flashed the kali linux iso onto an external hdd and installed kali linux onto my thumb drive, I also however installed the grub boot loader (when instructed) to the same storage device the kali linux OS would be installed on (which is the usb thumb drive) and I tried to boot it up after it was done installing and I was met with a black screen with a blinking cursor on the upper left corner of the screen, does anybody know what is happening? Help would be much appreciated.