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GRUB rescue
GRUB_DISABLE_OS_PROBER=true
reinstall grub in chroot
for i in /dev /dev/pts /proc /sys /run /run/lvm; do sudo mount --bind $i /mnt$i; done chroot /mnt grub-install /dev/sdX update-grub update-initramfs
grub rescue
ls ls (hd0,msdos1)/ ls (hd0,msdos7)/ set root=(hd0,msdos7) set prefix=(hd0,msdos7)/boot/grub insmod normal normal
After system startup
update-grub grub-install /dev/sda