I have installed (full installation) Ubuntu 22.04 into external SSD and is working fine. I removed internal HDD during installation. All Ubuntu partitions (boot, EFI, root, home etc.) reside in external SSD. Post Ubuntu installation, I put the internal HDD back in its place. During normal usage, when I upgrade Ubuntu (sudo apt upgrade), it adds entry in the Boot Menu of the UEFI partition of my PC's Internal HDD. This happens specifically when there is upgradation to newer Ubuntu kernel. How can I prevent Ubuntu to modify Boot Menu of my internal HHD? I do not have BIOS option to disable HDD.
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