On 10/29/24 15:02, Go Canes wrote:
On Tue, Oct 29, 2024 at 4:39 PM ToddAndMargo via users
<users@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
That is what I did. Did ot work:
# grub2-install /dev/nvme0n1 --force
If you are using UEFI, grub2-install is essentially a no-op (unless
something weird is going on). Here's why....
Take a look at the output of "sudo efibootmgr" - it will show you the
UEFI boot variables and which one you are currently booted from.
The variable you are booted from should look something like this:
Boot0000* Fedora
HD(1,GPT,166f3bf1-cd4a-487e-906a-2b0363cbabcd,0x800,0x64
000)/\EFI\FEDORA\SHIMX64.EFI
- This tells you that UEFI used a "Hard Drive" to boot, Hard Drive #1,
using a GPT partition table, and the partition with the specified UUID
(166f3bf1-cd4a-487e-906a-2b0363cbabcd in this example). Note that
this partition must be "vfat", so filenames are case-insensitive.
- From that partition, it loads the file "\EFI\FEDORA\SHIMX64.EFI".
- That file in turn continues the bootstrap. For this specific case,
SHIMX64.EFI loads grubx64.efi from the same directory, which
references grub.cfg from the same directory.
- grub.cfg tells grub how to find /boot, which it uses to find
/boot/grub2/grub.cfg
- etc.
Note something that is *not* referenced in this process - a MBR boot
record. What does grub2-install do? It installs grub2 into the MBR
boot record. (It *might* do other things as well, but I don't believe
rebuilding the grub2 menu is not one of them.)
Hope this helps you or anyone else trying to understand why
grub2-install is not typically needed or useful on a UEFI system.
Cool command. Thank you!
Does this tell you anything?
# efibootmgr
BootCurrent: 0000
Timeout: 1 seconds
BootOrder: 0000,0010,0003,0004,000E,000F
Boot0000* fedora
HD(1,GPT,6e58cd53-8fbd-4b97-bce2-fa7c43e105f3,0x800,0x64000)/\EFI\FEDORA\GRUBX64.EFI
Boot0003 Network Card
BBS(Network,,0x0)0000474f00004e4fb1000000010000007100490042004100200043004c00200053006c006f0074002000300030004600450020007600300031003100300000000501090006000000007fff040001041a00ae84b11df581724e85442bab0c2cac5c001f060200007fff040001044200ef47642dc93ba041ac194d51d01b4ce6490042004100200043004c00200053006c006f0074002000300030004600450020007600300031003100300000007fff04000000424f
Boot0004 UEFI: Built-in EFI Shell
VenMedia(5023b95c-db26-429b-a648-bd47664c8012)0000424f
Boot000E CD/DVD Drive
BBS(CDROM,,0x0)0000474f00004e4fa9000000010000006f00410054004100500049002000200020006900480041005300310032003400200020002000460000000501090003000000007fff040002010c00d041030a0000000001010600001703120a000200ffff00007fff040001043e00ef47642dc93ba041ac194d51d01b4ce6350033003400320032003700200038004e003200370038003700320030003500300036003600340000007fff04000000424f
Boot000F Hard Drive
BBS(HD,,0x0)0000474f00004e4fa7000000010000006f0054004f00530048004900420041002000440054003000310041004300410032003000300000000501090002000000007fff040002010c00d041030a0000000001010600001703120a000100ffff00007fff040001043e00ef47642dc93ba041ac194d51d01b4ce6200020002000200020002000200020002000200037002000460034004d005800480048005300540000007fff04000000424f
Boot0010* Fedora
HD(1,GPT,6e58cd53-8fbd-4b97-bce2-fa7c43e105f3,0x800,0x64000)/\EFI\FEDORA\SHIM.EFI0000424f
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