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How to repair grub bootloader after unplugging the hard drei
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antoniovalos
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Joined: 24 Mar 2023
Posts: 47
PostPosted: Sun Jun 30, 2024 2:55 am    Post subject: How to repair grub bootloader after unplugging the hard drei Reply with quote
I only unplugged my hard drive and plugged it again later, but the bootloader disappeared.
How and why does this happen?
How to repair the bootloader after unplugged the hard drive?
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netfab
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Joined: 03 Mar 2005
Posts: 1956
Location: 127.0.0.1
PostPosted: Sun Jun 30, 2024 7:22 am    Post subject: Reply with quote
If you have multiple disks, go to BIOS and select the right disk to boot to.
If you want precise answers, give more details.
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54577
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PostPosted: Sun Jun 30, 2024 10:26 am    Post subject: Reply with quote
antoniovalos,

Some EFI systems auto erase unavailable boot options.
If you booted with the HDD removed, its contents are probably OK.
You need to regenerate the efivars for the system on the drive.
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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pietinger
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Joined: 17 Oct 2006
Posts: 5069
Location: Bavaria
PostPosted: Sun Jun 30, 2024 10:47 am    Post subject: Reply with quote
antoniovalos,

maybe read first this to understand UEFI booting better:
https://wiki.gentoo.org/wiki/User:Pietinger/Tutorials/Boot_kernel_via_UEFI
read up to this paragraph:
Quote:
Most (all?) UEFIs check at system startup whether the UEFI entries also point to an actually existing binary.efi ... and if not, UEFI simply deletes the entry. This means that if you make an entry for \efi\backup\bzImage.efi in the next chapter, it will be displayed, but if no \efi\backup\bzImage.efi exists, your UEFI will delete this entry the next time you start the system.

and then check WHAT you have booted before. Was it a grub ?

If yes, you must chroot (*) into your Gentoo system and install grub again (because this install routine creates also the UEFI entry for \efi\gentoo\grubx64.efi) with grub-install --efi-directory=/efi

Do this only if your ESP is mounted to /efi ... IF YOU HAVE AN OLD installation where you mount your ESP to /boot then:

1. Read this: https://forums.gentoo.org/viewtopic-t-1165115-highlight-.html
2. Use: grub-install --efi-directory=/boot

*) https://wiki.gentoo.org/wiki/User:Pietinger/New_at_Gentoo#Pause_during_Installation
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