just trying to understand what I did wrong.
You might not have done anything wrong.
There is also the possibility of a bad USB drive or write memory failure. There is lots of things that could go wrong that’s not your fault. Might try a different USB or a different USB port on your machine.
You might want to try zeroing out the USB, if=/dev/zero
. Then you might need to make a new partition table. You can use something like gparted. Or https://linuxconfig.org/how-to-manipulate-partition-tables-with-fdisk-cfdisk-and-sfdisk-on-linux
You can try GPT or DOS. I dont think it matters.
Not sure if the ISO will have the partition table so you might want make the new partition table just to be sure the stick defiantly has one. If dd overwrites it from the iso no harm no foul.
Thats all the troubleshooting steps I can think of right now.
Well of course I know him. He’s me.