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Hi all and happy new year.

Today, I update my Xubuntu installation and after reboot I can't boot anymore. Screen says:

Failed to open \EFI\BOOT\grubx64.efi - Not found Failed to load image \EFI\BOOT\grubx64.efi: Not found Failed to open \EFI\BOOT\MokManager.efi - Not found Failed to load image \EFI\BOOT\MokManager: Not found

and then a message asking for a bootable disk. I try different methods to fix the problem, like this post or this, but the problem persist.

After that, I use boot-repair and perform the recommended repair. After a successfully boot repair, I reboot the PC but the problem persist. Here is the complete report: http://paste.ubuntu.com/14422731/

I appreciate any help. All the best,

Christian.

An update: Using SuperGrub disk I can able to find this error: Faild to mount /boot/efi, type S to skip it, or type M to fix it manually. M put me in a console for repair and S proceed, with some error, in boot.

Since the system was unable to mount nothing in /boot/efi, I try to mount manually: sudo mount /dev/sda1 /boot/efi and the error was: mount: wrong fs type, bad option, bad superblock on /dev/sdc1, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so

So, I run dmesg | tail and found this message: [ 510.816445] FAT-fs (sdb1): IO charset iso8859-1 not found

To check the media, I run a fsck.vfat on /dev/sdb1 and nothing look wrong: fsck.fat 3.0.26 (2014-03-07) /dev/sdb1: 691 files, 4632/130812 clusters

So...a bug in the last kernel update?

Greetings, chq

Community
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christian
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1 Answers1

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Finally I found a solution:

  1. Enter with a live Xubunto usb-disk
  2. Thinking in a probable bug when update from kernel 3.13.0-43 to 3.13.0-74, using gparted, I reformat sdb1 and flag as boot partition
  3. I reboot and re-enter with SuperGrub usb-drive to my sdb2 system with the 3.13.0-74 kernel.
  4. I mount efi running sudo /dev/sdb1 /boot/efi without problems and then install grub using sudo grub-install --bootloader-id xubuntu /dev/sdb
  5. Before reboot, disable quiet splash
  6. While reboot a message say /boot/efi not found appears, but still can boot pressing S. I compare the UUID of fstab and blkid and ofcourse, after remove and recreate boot partition, id was not the same. So, I remove the old line from fstab and reboot.

Voila...it's work!

christian
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