монтирование iso и запись в него

#!/bin/sh
# Compile the KolibriOS kernel on Linux
# 2017, The KolibriOS team

KERPACK=$HOME/kolibrios/programs/other/kpack/kerpack_linux/kerpack
KOLIBRI_IMG=$HOME/nightly/kolibri.img

replace=1; # Replace kernel in the image file?
echo 'lang fix en' > lang.inc
fasm -m 65536 bootbios.asm bootbios.bin
fasm -m 65536 kernel.asm kernel.mnt
$KERPACK kernel.mnt kernel.mnt

[[ $replace -eq 1 ]] && {
    mntpt=$(mktemp -d)
    sudo mount -o loop $KOLIBRI_IMG $mntpt
    sudo mount -o remount,rw $mntpt
    sudo cp kernel.mnt ${mntpt}/KERNEL.MNT
    sudo umount $mntpt
    rmdir $mntpt
}

KOLIBRI_IMG=$HOME/nightly/kolibri.iso

mount: /home/serrrgggeee/nightly/kolibri.img: failed to setup loop device: No such file or directory
mount: /tmp/tmp.Us69b2mdne not mounted or bad option

       In some cases useful info is found in syslog - try
       dmesg | tail or so.
umount: /tmp/tmp.Us69b2mdne: not mounted
rmdir: failed to remove '/tmp/tmp.Us69b2mdne': Directory not empty

dd if=/dev/zero of=$HOME/nightly/kolibri.iso bs=1M count=5

mount: wrong fs type, bad option, bad superblock on /dev/loop7,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.
mount: /tmp/tmp.098UCUzNRq not mounted or bad option

       In some cases useful info is found in syslog - try
       dmesg | tail or so.
umount: /tmp/tmp.098UCUzNRq: not mounted
rmdir: failed to remove '/tmp/tmp.098UCUzNRq': Directory not empty