Rescue
If you are here, something has gone wrong.
My System Won't Boot
Windows
NOTE: This section only applies to problems arising when dual-booting. If you choose Windows in Grub, and it doesn't boot, follow these steps.
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Boot into a Windows Live Media (also called Recovery Media or Installation Media)
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Hit next
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Choose "repair your computer"
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Hit Troubleshoot
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Hit Command Prompt
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Execute
bootrec /fixmbr -
Execute
bcdboot c:/windows -
Try booting now
Linux
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Boot into a Live USB
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Find your root partition with gparted
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Launch gparted
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Note the hard drive name (
DRIVE) and the name of your main partition (ROOT-PATH) (something like /dev/sda1 or /dev/nvme0np1)
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To re-install grub run these commands
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sudo mount ROOT-PATH /mnt -
sudo mount –bind /sys /mnt/sys -
sudo mount –bind /proc /mnt/proc -
sudo mount –bind /dev /mnt/dev -
If you have a separate boot partition, mount that now to /mnt/boot
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sudo chroot /mnt -
sudo grub-install DRIVE -
sudo grub-mkconfig -o /boot/grub/grub.cfg(make sure /boot/grub exists, it may be under /boot/grub2)
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Booting a live iso and re-installing grub