Am 02.10.20 um 11:12 schrieb Petr
Pisar:
If you do not state the devicename, how does grub choose the correct drive? I don't want to overwrite the bootloader on the ssd.On Thu, Oct 01, 2020 at 11:07:28AM -0700, Samuel Sieb wrote:On 10/1/20 5:52 AM, Marius Schwarz wrote:Is it possible to boot from the stick and then perform a grub-install with an old grub?This attempt failed too: # grub2-install /dev/sda grub2-install: Fehler: /usr/lib/grub/x86_64-efi/modinfo.sh existiert nicht. Bitte geben Sie --target oder --directory an. and that file seems not to be part of any package. There is only one for "i386-pc".You can't (and must not!) use grub2-install on an EFI system.Of course you have. How else would you get GRUB EFI executable onto the boot partition and register it into boot environments? But the correct invocation for EFI systems is different. You just use "grub2-install" without the disk device name.
by entering "grub2-install /dev/sdb" where sdb was the usb drive, grub2 removed the working boot config from .. you guessed it by now.. the ssd :(
The repair try, done by the docs.fp.org....bootloading-with-grub2 guide, honestly said, it wants to install i386 on a clearly x64 system.
FYI: Not working without manual corrections
insmod lvm
insmod xfs
set root=(hd0,gpt3)
configfile /grub2/grub.cfg
linux /vmlinuz-5.8.10....
initrd /initramfs-5.8.10....
boot
Q: Why is configfile read, but not used if anything important is in it i.e. the sysroot options passed to "linux" to find the decrypted luks partition?
AFTER this: i managed to boot the system, by manually mounting the dm-0 device to /sysroot
BUT:
grub2-mkconfig -o /boot/grub2/grub.cfg
grub2-install --boot-directory=/boot /dev/nvm0n1 did not succeed in recreating a working boot environment, in fact, nothing changed. Still not presenting a grub menu, where grub2-mkconfig said, it created the menu. (i hate lying tools)Q: What did anaconda different on the first installation of Fedora, to make it work?
--> HELP needed <--
Lesson learned: once it's on a system, don't play with grub2-install.
Marius
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