I use Unetbootin to do this. It's very easy and i, along with others, have experienced a lot of issues with BalenaEtcher.
to install Unetbootin, add the ppa
sudo add-apt-repository ppa:gezakovacs/ppa
And install
sudo apt update
sudo apt install
Insert your USB stick. Run Unetbootin from your App Menu. At the bottom of the Unetbootin window, you will see ISO
. Browse to the location of your ISO (e.g. ~/Downloads) and ensure that the write device is set to your USB (e.g. sdc1).