errore installando systemrescuecd su chiavetta usb

Ciao, sto provando a installare systemrescuecd su una chiavetta da 16GB usando questo video https://www.youtube.com/watch?v=blhS1CP-sZ4 ma mi da errore

sergio@sergio:~$ mount -o loop,exec /home/sergio/Scaricati/systemrescuecd-x86-5.2.2.iso /tmp/cdrom
mount: only root can use "--options" option
sergio@sergio:~$ sudo mount -o loop,exec /home/sergio/Scaricati/systemrescuecd-x86-5.2.2.iso /tmp/cdrom
[sudo] password di sergio: 
mount: /tmp/cdrom: /home/sergio/Scaricati/systemrescuecd-x86-5.2.2.iso is already mounted.
sergio@sergio:~$ sudo dismount -o loop,exec /home/sergio/Scaricati/systemrescuecd-x86-5.2.2.iso /tmp/cdrom
sudo: dismount: comando non trovato
sergio@sergio:~$ sudo unmount -o loop,exec /home/sergio/Scaricati/systemrescuecd-x86-5.2.2.iso /tmp/cdrom
sudo: unmount: comando non trovato
sergio@sergio:~$ sudo umount -o loop,exec /home/sergio/Scaricati/systemrescuecd-x86-5.2.2.iso /tmp/cdrom
umount: opzione non valida -- "o"
Try 'umount --help' for more information.
sergio@sergio:~$ sudo umount /home/sergio/Scaricati/systemrescuecd-x86-5.2.2.iso /tmp/cdrom
umount: /home/sergio/Scaricati/systemrescuecd-x86-5.2.2.iso: umount failed: Argomento non valido.
sergio@sergio:~$ sudo umount loop,exec /home/sergio/Scaricati/systemrescuecd-x86-5.2.2.iso /tmp/cdrom
umount: loop,exec: no mount point specified.
umount: /tmp/cdrom: not mounted.
sergio@sergio:~$ sudo mount -o loop,exec /home/sergio/Scaricati/systemrescuecd-x86-5.2.2.iso /tmp/cdrom
mount: /tmp/cdrom: WARNING: device write-protected, mounted read-only.
sergio@sergio:~$ cd /tmp/cdrom
sergio@sergio:/tmp/cdrom$ ls
boot      efi       ntpasswd    sysrcd.dat  usb_inst     usbstick.htm
bootdisk  isolinux  readme.txt  sysrcd.md5  usb_inst.sh  version
sergio@sergio:/tmp/cdrom$ 
sergio@sergio:/tmp/cdrom$ bash ./usb_inst.sh
./usb_inst.sh: This script requires root privileges to operate.
Please, read the manual for more help about this script
Web: http://www.system-rescue-cd.org
sergio@sergio:/tmp/cdrom$ sudo bash ./usb_inst.sh
No valid USB/Removable device has been detected on your system
sergio@sergio:/tmp/cdrom$ sudo bash ./usb_inst.sh
Device [/dev/sdb] detected as [SanDisk  Cruzer          ] is removable and size=15389MB
* Device [/dev/sdb] is not mounted
dialog: loadlocale.c:130: _nl_intern_locale_data: Assertion `cnt < (sizeof (_nl_value_type_LC_TIME) / sizeof (_nl_value_type_LC_TIME[0]))' failed.
./usb_inst.sh: riga 491:  6760 Annullato               (core dump creato) ${PROG_DIALOG} --infobox "$1" 20 75
dialog: loadlocale.c:130: _nl_intern_locale_data: Assertion `cnt < (sizeof (_nl_value_type_LC_TIME) / sizeof (_nl_value_type_LC_TIME[0]))' failed.
./usb_inst.sh: riga 491:  6762 Annullato               (core dump creato) ${PROG_DIALOG} --infobox "$1" 20 75
sergio@sergio:/tmp/cdrom$ gnome-screenshot --window
sergio@sergio:/tmp/cdrom$ sudo mount -o remount,exec /media/cdrom
mount: /media/cdrom: mount point does not exist.
sergio@sergio:/tmp/cdrom$

secondo voi che è successo ?