What I forgot is that .nrg files are images used in Nero. I don't have Nero, I use K3B.
Thanks to the folks at linuxquestions.org, they gave some insight as to the situation. If you strip the first 300 bytes of data off the .nrg file, the remainder is an ISO file.
So to change a .nrg file to an .iso file so you can burn it, open up a terminal/console/shell (Konsole) window. Change to the directory the .nrg file is in, and type:
dd bs=1k if=image.nrg of=image.iso skip=300Replace image.nrg with then name of your .nrg file (something.nrg), replace image.iso with the name you want your outgoing file to be (something.iso)
Then burn the disc using K3b and the .iso file that you just created.
Uh... don't forget to burn the disc as an image, not as data.
Here's the link I found for the UNIX command dd.
Disclaimer: K3b did a checksum before burning and it was successful. So I guess the checksum is on the actual data and not the extraneous Nero data. I haven't actually installed the CD yet, though, so we'll see...