The OS is not installed in the BIOS bootloader. What to do!?

Question

linux

Hello.
I'm hysterical.
I'll start by saying that I wanted to install BlackArch. Suspecting nothing, I started with LIVE and started the installation. Everything went well and without errors. I turn off my laptop. I take out the flash drive. I turn it on. And ... Throws in Bios ... I look in the boot menu - nothing. Empty at all. OK. I think it's a bad install. I insert a flash drive with Kali and run the installer. Everything is fine until it comes to installing GRUB. At the "grub-install dummy" step, it throws an error like: "Unable to execute the grub-install dummy command. This is a non-functional error." Help! What to do?? Neither OS is installed. There are no other flash drives with OS. I'm at a dead end. Tried to boot into LIVE in Kali and write: "apt-get install grub" and then "grub-install dummy". Unsuccessfully. I also tried to disable "Fast Boot" in the BIOS item BOOT. Just as unsuccessful. I do not know what to do. Now I'm in LIVE mode. Hopefully someone can give me some advice or point me in the right direction.