rpi-clone -f sdb error: sed: couldn't open temporary file /mnt/clone/boot/firmware/sed3GoEiW: Read-only file system

[hanyuanzhong]

lsblk

sudo mkfs.vfat /dev/sdb1
sudo mkfs.ext4 /dev/sdb2

sudo umount /dev/sdb1
sudo umount /dev/sdb2

lsblk

sudo systemctl stop udisks2
sudo systemctl stop udev
sudo systemctl stop systemd-udevd-control.socket
sudo systemctl stop systemd-udevd-kernel.socket
sudo systemctl daemon-reload

sudo rpi-clone -f sdb