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Permanent GRUB Config Changes on Aurora (and possibly other atomic distros?)
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Aurora is based on Fedora Kinoite, a RHEL-type system; you're looking at Debian-type info in that link. Have a look to the Fedora docs to learn how grub is managed in this ecosystem: https://docs.fedoraproject.org/en-US/fedora/latest/system-administrators-guide/kernel-module-driver-configuration/Working_with_the_GRUB_2_Boot_Loader/
Assuming you're just trying to add kernel arguments, you can use the rpm-ostree kargs
command: https://docs.fedoraproject.org/en-US/fedora-coreos/kernel-args/#_modifying_kernel_arguments_on_existing_systems
I'll have to check this out next time I visit my friend