Ubuntu, according to its official build script, embeds the following GRUB modules in its signed GRUB EFI binary grub圆4.efi: If the GRUB modules are not embedded in the EFI binary, and GRUB tries to sideload/ insmod them, GRUB will fail to boot with the message: Since GRUB version 2.06.r261.g2f4430cc0, loading modules in Secure Boot Mode via insmod is no longer allowed, as this would violate the expectation to not sideload arbitrary code. When using Shim-lock, GRUB can only be successfully booted in Secure Boot mode if its EFI binary includes all of the modules necessary to read the filesystem containing the vmlinuz and initramfs images. Note: Before following this section you should make sure you have followed the instructions at Secure Boot#shim and have sbsigntools set-up and ready to receive keys. Remember to #Generate the main configuration file after finalizing the configuration. Note that grub-install also tries to create an entry in the firmware boot manager, named GRUB in the above example – this will, however, fail if your boot entries are full use efibootmgr to remove unnecessary entries. Read /Tips and tricks#Alternative install method for how to specify an alternative location. # grub-install -target=x86_64-efi -efi-directory= esp -bootloader-id=GRUBĪfter the above installation completed, the main GRUB directory is located at /boot/grub/. Some motherboards cannot handle bootloader-id with spaces in it.If for some reason it is necessary to run grub-install from outside of the installed system, append the -boot-directory= option with the path to the mounted /boot directory, e.g -boot-directory=/mnt/boot. That means if you are booting from the live installation environment, you need to be inside the chroot when running grub-install. Make sure to install the packages and run the grub-install command from the system in which GRUB will be installed as the boot loader.Execute the following command to install the GRUB EFI application grub圆4.efi to esp/EFI/GRUB/ and install its modules to /boot/grub/x86_64-efi/.A directory of that name will be created in esp/EFI/ to store the EFI binary and this is the name that will appear in the UEFI boot menu to identify the GRUB boot entry. Choose a boot loader identifier, here named GRUB.Mount the EFI system partition and in the remainder of this section, substitute esp with its mount point.Then follow the below steps to install GRUB to your disk: Follow the instructions in Unified Extensible Firmware Interface#Checking the firmware bitness to figure out your UEFI's bitness.įirst, install the packages grub and efibootmgr: GRUB is the boot loader while efibootmgr is used by the GRUB installation script to write boot entries to NVRAM. For IA32 (32-bit) UEFI (not to be confused with 32-bit CPUs), replace x86_64-efi with i386-efi where appropriate. The section assumes you are installing GRUB for 圆4 (64-bit) UEFI.A /EFI examples article has been provided for such cases. The procedure described below is intended to work on a wide range of UEFI systems but those experiencing problems despite applying this method are encouraged to share detailed information, and if possible the workarounds found, for their hardware-specific case. UEFI firmwares are not implemented consistently across manufacturers.If you want to use any additional GRUB module that is not included in the standard GRUB EFI file grub圆4.efi on a Secure Boot system, you have to re-generate the GRUB EFI grub圆4.efi with grub-mkstandalone or reinstall GRUB using grub-install with the additional GRUB modules included. As discussed in #Shim-lock, this is not the case on UEFI systems with Secure Boot enabled. This whole article assumes that inserting additional GRUB2 modules via insmod is possible.Follow EFI system partition#Check for an existing partition to find out if you have one already, otherwise you need to create it. To boot from a disk using UEFI, an EFI system partition is required.Installing to the fallback boot path will still work even in BIOS mode since it does not touch the NVRAM. When installing to use UEFI it is important to boot the installation media in UEFI mode, otherwise efibootmgr will not be able to add the GRUB UEFI boot entry.It is recommended to read and understand the Unified Extensible Firmware Interface, Partitioning#GUID Partition Table and Arch boot process#Under UEFI pages.
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