mint@mint:~$ sudo mount /dev/sdb1 /mnt
mint@mint:~$ sudo mount /dev/sdb2 /mnt/boot/efi
mint@mint:~$ sudo mount --bind /dev /mnt/dev
mint@mint:~$ sudo mount --bind /proc /mnt/proc
mint@mint:~$ sudo mount --bind /sys /mnt/sys
mint@mint:~$ sudo chroot /mnt
root@mint:/# exit
exit
mint@mint:~$ sudo mount --bind /run /mnt/run
mint@mint:~$ sudo chroot /mnt
root@mint:/# update-initramfs -u
update-initramfs: Generating /boot/initrd.img-5.15.0-119-generic
root@mint:/# update-grub
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/50_linuxmint.cfg'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-5.15.0-119-generic
Found initrd image: /boot/initrd.img-5.15.0-119-generic
Found linux image: /boot/vmlinuz-5.15.0-118-generic
Found initrd image: /boot/initrd.img-5.15.0-118-generic
Found linux image: /boot/vmlinuz-5.15.0-56-generic
Found initrd image: /boot/initrd.img-5.15.0-56-generic
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
grub-probe: error: cannot find a GRUB drive for /dev/sdc2.  Check your device.map.
Found Windows Boot Manager on /dev/sda1@/efi/Microsoft/Boot/bootmgfw.efi
done
root@mint:/# exit
exit
mint@mint:~$ sudo umount /mnt/dev
mint@mint:~$ sudo umount /mnt/proc
mint@mint:~$ sudo umount /mnt/sys
mint@mint:~$ sudo umount /mnt/run
mint@mint:~$ sudo umount /mnt/boot/efi
mint@mint:~$ sudo umount /mnt