Tente isto:
mount /dev/sda2 /mnt/recovery
mount -t sysfs none /mnt/recovery/sys
mount -t proc none /mnt/recovery/proc
mount --bind /dev/ /mnt/recovery/dev
mount --bind /dev/pts /mnt/recovery/dev/pts
mount -o bind /etc/resolv.conf /mnt/recovery/etc/resolv.conf
chroot /mnt/recovery