How to Update GRUB on Rocky Linux 9.5

To update GRUB on Rocky Linux 9.5 --

1.  Identify the system boot type (BIOS or UEFI) .

This can be determined by:

Checking BIOS/UEFI settings

... or ...

Checking the disk file system ...

                $>sudo df -h

... if output contains a ' /boot/efi ' directory; the system boot type is likely UEFI .

2.  Edit the ' /etc/default/grub ' file with nano editor ...

        $>sudo nano /etc/default/grub

Find the line that begins with ' GRUB_CMDLINE_LINUX_DEFAULT ' or ' GRUB_CMDLINE_LINUX '

Example:  GRUB_CMDLINE_LINUX="blah blah blah"

Use arrow keys to maneuver to the end of the line; and append it with ' pcie_aspm=off ' ; note that there are no spaces immediately preceding or following the quotes < " > .

Example: GRUB_CMDLINE_LINUX="blah blah blah pcie_aspm=off"

' Ctl+O ' to commit changes to the editor buffer

' Ctl+X ' to exit the editor

 3.  Update GRUB with the appropriate command ...

For BIOS:

        $>sudo grub2-mkconfig -o /boot/grub2/grub.cfg

For UEFI:

        $>sudo grub2-mkconfig -o /boot/efi/EFI/rocky/grub.cfg

This may respond with ...

Running `grub2-mkconfig -o /boot/efi/EFI/rocky/grub.cfg' will overwrite the GRUB wrapper.

Please run `grub2-mkconfig -o /boot/grub2/grub.cfg' instead to update grub.cfg.

GRUB configuration file was not updated.

... if so; apply ...

                $>sudo grub2-mkconfig -o /boot/grub2/grub.cfg