Problem creating NomadBSD persistent live system for USB flash drive

I’m trying to make a persistent usb flash drve
(using Ubuntu)
using the linux command I saw in
https://nomadbsd.org/download.html
but …
~/Downloads$ xzcat nomadbsd-130R-20210508.amd64.img.lzma | dd of=/dev/sdb bs=1M
dd: failed to open ‘/dev/sdb’: Permission denied

can anybody help ?

Try the command:

xzcat nomadbsd-130R-20210508.amd64.img.lzma | sudo dd of=/dev/sdb bs=1M

this command worked!
the persistent flash drive was created in just a few minutes