Comment by Kamil Maciorowski on Why am I getting a Chromebook dd command error: No space left on a drive that has enough space?

Any advice that includes >/dev/your_device may be somewhat problematic because you need sudo for writing. Either use an elevated shell (sudo -i) or the trick with sudo tee (here, without -a in your case). An example command with sudo tee is <your.iso sudo tee /dev/your_device >/dev/null or (if you need a progress bar) pv your.iso | sudo tee /dev/your_device >/dev/null.