USB with Kali Linux 2024.1 (not live) installed not visible in boot menu

Specifications: Laptop: Lenovo Legion Pro 5i (Gen 8) CPU: i9 (13th Gen) GPU: Nvidia Geforce RTX 4060 USB B is a SanDisk Ultra Luxe (128GB) For context: Secure boot is off. USB ports are working properly. I have 2 USBs. USB A (Kali Linux 2024.1 installer) and USB B (to be installed with the Kali Linux system). After installation was completed, USB A and B were visible in the boot menu and I was able to boot into USB B (Kali Linux system). After booting in, I installed GRUB for USB B again as this was my 3rd time trying to fix this problem and I was under the impression that GRUB was not properl

Question by cececec on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.