Re: restoring fedora boot manager

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


On 9/21/2023 5:53 PM, Wolfgang Pfeiffer wrote:
On Wed, Sep 20, 2023 at 09:02:42AM +0100, Barry wrote:

On 20 Sep 2023, at 01:41, Bill Cunningham <bill.cu1234@xxxxxxxxx> wrote:

    I had to reinstall my windows system which is fine it takes care of itself. But, I have to install my entire fedora system from scratch. Is there a way to simply reinstall the boot loader code without having to install from scratch with a UEFI system? I'm sure there is but I don't know about it. There's also a command called "efibootmgr" is this what I am looking for? AFAIK fedora doesn't install more partitions but just code in the /boot/efi partition. How can I reinstall or repair boot loader code without touching the system? Without having to reinstalling from scratch?

In my notes I saved this command for fixing fedora booting on one of my systems. (I had a system that would fill its EFI variable space and need a full reset)

efibootmgr --create --disk /dev/md126 --part 2 --loader /EFI/fedora/shim.efi --label Fedora

In this case /dev/md126 is my raided fedora disk, replace with your disk.

/dev/md126p2 - VFAT - EFI

Partition 2 is what is mounted on /boot/EFI, change the 2 as needed.

From my notes :)  .. :

add a boot entry:
efibootmgr -c -d /dev/sdb -p 1 -w -L Debian -l "\EFI\debian\grubx64.efi"

If I recall correctly:
This command above was done a machine where /dev/sdb was a disk where
Debian was already installed. The 'man' page should explain the rest
of the options.

At the end of "man efibootmgr" you should find an example for a Fedora
install - it says "The default OS Loader is \EFI\fedora\grub.efi"
But that looks wrong to me. My guess would be that this should say for
a nowadays Fedora install probably:

The latter at least was what I saw with a quick Internet search and
the output from entering "efibootmgr" on my own Fedora install here. Excerpt:

[ ....]
Boot0002* Fedora    HD(1,GPT,[..])/File(\EFI\fedora\shim.efi)
[ .... ]

See the "\EFI\fedora\shim.efi" section above..

I'd simply take some Live system on a thumb, boot it, and then have a
look at the output of

# efibootmgr

and proceed with that info ...

Good luck!

What I would like to do for example, is if I removed a Windows OS, for example, the partition data (for fedora) would need to be reset. Say I reinstalled the system (windows). I believe that windows could take care of itself but I am going to have an unbootable fedora there.

    Am I going to need to remove some data and let the system create a new UUID? That's exactly what I am running into. Needing to re enter boot code to rescue a fedora system. That would be done with a thumb drive. And efibootmgr would be an option in fixing boot loading. Simply removing the "fedora" directory in 'Boot/efi' might clean things but something is going to be re-written.

I will look into all this. TO be clear rescuing a fedora system is what I want to do.


users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx
Fedora Code of Conduct:
List Guidelines:
List Archives:
Do not reply to spam, report it:

[Index of Archives]     [Older Fedora Users]     [Fedora Announce]     [Fedora Package Announce]     [EPEL Announce]     [EPEL Devel]     [Fedora Magazine]     [Fedora Summer Coding]     [Fedora Laptop]     [Fedora Cloud]     [Fedora Advisory Board]     [Fedora Education]     [Fedora Security]     [Fedora Scitech]     [Fedora Robotics]     [Fedora Infrastructure]     [Fedora Websites]     [Anaconda Devel]     [Fedora Devel Java]     [Fedora Desktop]     [Fedora Fonts]     [Fedora Marketing]     [Fedora Management Tools]     [Fedora Mentors]     [Fedora Package Review]     [Fedora R Devel]     [Fedora PHP Devel]     [Kickstart]     [Fedora Music]     [Fedora Packaging]     [Fedora SELinux]     [Fedora Legal]     [Fedora Kernel]     [Fedora OCaml]     [Coolkey]     [Virtualization Tools]     [ET Management Tools]     [Yum Users]     [Yosemite News]     [Gnome Users]     [KDE Users]     [Fedora Art]     [Fedora Docs]     [Fedora Sparc]     [Libvirt Users]     [Fedora ARM]

  Powered by Linux