I tried to install Linux on a Mac Pro that looked like the one in the article. It turns out that it didn't support booting from USB. I didn't have any blank CDs

I tried to install Linux on a Mac Pro that looked like the one in the article. It turns out that it didn't support booting from USB. I didn't have any blank CDs nor a CD burner (does anyone?) so I gave up and it sat in a corner.