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mount /dev/sda2 /mnt #root partition
mount /dev/sda1 /mnt/boot/efi #? ESP partition
for i in /dev /dev/pts /proc /sys; do mount -B $i /mnt$i; done
chroot /mnt
grub-install /dev/sda1
grub-install --recheck /dev/sda1
#vi /etc/default/grub
#GRUB_DISABLE_OS_PROBER
grub-mkconfig -o /boot/grub/grub.cfg
update-grub
exit && for i in /dev /dev/pts /proc /sys; do umount $i /mnt/boot-sav/sda2$i; done
umount /mnt/boot/efi
umount /mnt
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grub-install /dev/sdaне правильно
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efibootmgr --bootnum xxxx --delete-bootnum
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