chroot: failed to run command ‘update-initramfs’: No such file or directory

[yslys]

I am currently following the instructions on https://github.com/carlosedp/riscv-bringup/tree/master/Qemu, willing to build a RISC-V disk image.

OpenSBI version: v0.8
Linux version: v5.10.0
U-Boot version: v2020.04

While building the disk image, I used the pre-built Debian tarball following this command:

wget -O rootfs.tar.bz2 https://github.com/carlosedp/riscv-bringup/releases/download/v1.0/debian-sid-riscv64-rootfs-20200108.tar.bz2

When I reached the step:

# Generate initrd on rootfs by using chroot
sudo chroot rootfs update-initramfs -k all -c

I think there might be a minor mistake in the tutorial. In the tutorial, it states that:

pushd rootfs
...
# Generate initrd on rootfs by using chroot
sudo chroot rootfs update-initramfs -k all -c

# Unmount and disconnect nbd
popd

I think it should be popd first, then we could execute chroot command.

However, if I execute the chroot command inside the rootfs directory, the error would be:

chroot: cannot change root directory to 'rootfs': No such file or directory

If I execute the chroot command in the parent directory of rootfs, the error I got was:

chroot: failed to run command ‘update-initramfs’: No such file or directory

I have update-initramfs installed on my host machine. May I know how to solve this?