Subscribed to your YouTube channel.

I pretty much followed the same steps, except the erase in the partition step never worked until I switched to the manual install in the terminal, made changes to the partition, but the installation still failed, so I restarted, and this time the partition step worked.

What never worked was the unfree software. It never showed me the dialogue box, it just failed. It makes me wonder why bit happened, and if the installation can be trusted...