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sudo sh -c 'echo "GRUB_DISABLE_LINUX_UUID=true" >> /etc/default/grub'
sudo rm /boot/grub2/grub.cfg
sudo rm /etc/grub.d/* -R
sudo rm /etc/sysconfig/grub
yum reinstall -y grub2-tools
grub2-mkconfig -o /boot/grub2/grub.cfg
grub2-install /dev/sda
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