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there are several methods to run a BootInfo, see the Ubuntu community doc about BootInfo. you can use GRUB-Customizer or manually edit GRUB.


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From my experience and from what I read above, I think it has to do with BIOS settings: I have experienced the same problem today, after a power failure; A BIOS boot mode configuration reverted from "Normal Boot" to "Fast Boot" and the problem showed until I changed it back to "Normal Boot" in the BIOS to solve it.


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Once you are in live usb try the following comments sudo -i apt-get update apt-get install lvm2 {IF FILE SYSTEM IS ENCRYPTED => DECRYPT} vgscan --mknodes *##not down the volume name##* mount /dev/<volume-name>/root /mnt *## For me 'ubuntu-vg' ##* mount /dev/sda1 /mnt/boot *## fdisk -l for right sd--##* ...


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Boot on an Ubuntu disc (USB or DVD). Choose 'Try Ubuntu'. Connect internet Install and run Boot-Repair Alternatively, you can: Download a Boot-Repair-Disk image Burn it on a CD or an USB key Boot on it. This will launch the Boot-Repair utility automatically.



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