2

My pc does not boot anymore in EFI/UEFI mode. I had grub installed and was able to boot on both Windows 10 and Ubuntu Linux (14.04 LTS). I recently tried to install Fedora Workstation 29 'automatically' making space from the ubuntu partition. Since then I have not been able to boot in EFI/UEFI. The boot process simply do not see the hard drive as an EFI boot disk. I have tried to remove the Fedora installation, I installed a new version of ubuntu and nothing works. I have tried to reinstall windows, but I cannot boot from window flash drive. I can boot from linux flash drives, and from there I can see the disk partitions (even if I can't mount the Windows partition as it seems to be in hibernation state). Is there any possibility to restore the machine in working state? What am I supposed to do? I have tried asking for help here and here with scarse success.

EDIT: I've been able to boot the local ubuntu disk with Super Grub2 Disk. It actually gave me access to the grub rescue terminal. From there I was able to:

set root=(hd0,msdos1)
set prefix=(hd0,msdos1)/boot/grub
insmod normal
normal

this procedure gave me access to a set of bootable kernels, only the old ubuntu one is working. From ubuntu I mounted the windows partition

sudo mount -o remove_hiberfile /dev/sda4 /mnt/win

backup my windows and linux files.

Next step will be to format/reinstall Linux. From there I have to figure out how to reinstall Windows.

Improve this question

1 Answer 1

Reset to default
2

I would personally use a tool which will try to find and repair the boot partition. First boot on a live Ubuntu distro and install boot-repair:

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt update
sudo apt install boot-repair

And then execute and hopefully recover the previous state with success (this tool saved me once a couple of months ago):

boot-repair
Improve this answer
3
  • Hello marc, thanks for your answer. I run the boot-repair on mt system, and here are the system diagnostics. I had no luck with this tool, I think my problem is somehow related to the fact that when I installed fedora the boot system was LVM (i.e. I messed up with things I do not understand properly). Now I cannot see my sata HD as a valid EFI device for booting.
    – Eamon
    Dec 29, 2018 at 10:22
  • First to see if it is still there and avoid getting into specifics...did you tried Super Grub2 Disk live distro?
    – marc
    Dec 29, 2018 at 14:50
  • I can see the drives and also mount them if I boot from a live-usb (both fedora and ubuntu). I have tried grub2-install with no success. My problem is that on the boot the system does not see ant Uefi source/hd.
    – Eamon
    Dec 29, 2018 at 23:21

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.