On Wed, Nov 15, 2023 at 11:33 AM fedoraUser 2023 fedorauser86@gmail.com wrote:
Fedora/CentOS/RHEL boot only from this grub. When install Fedora and CentOS, CentOS no boot from Fedora boot loader, Fedora no boot From CentOS boot loader. Why?
Have you updated GRUB recently?
As I understand things, GRUB is not updated automatically. Once installed, it has to be updated manually. In fact, it is an option upgrade step at https://docs.fedoraproject.org/en-US/quick-docs/upgrading-fedora-offline/#sect-update-grub-bootloader-on-bios.
And there's the forbidden signature database that blacklists buggy versions of GRUB... https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/managing_monitoring_and_updating_the_kernel/updating-the-secure-boot-revocation-list_managing-monitoring-and-updating-the-kernel.
Jeff