What is the file /etc/grub.d/10_linux doing?
It identifies Linux kernels on the root device and creates relevant menu entries
It sets Linux related environmental variables.
Maps BIOS drives and Linux devices.
Loads a Linux kernel and initramfs
https://www.suse.com/documentation/sled-12/book_sle_admin/data/sec_grub2_file_structure.html
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