[ubuntu] 13.04 .iso too big for a CD

I just downloaded the Ubuntu 23.04 32 bit desktop .ISO file and tried to burn it on to a CD. The program refused to burn the CD as the content was too large for the disk. I then tried burning it to a DVD. This appeared to burn successfully, but the desktop PC will not boot from it. It will boot from other CDs, so what am I doing wrong?

Thanks

Kw