Yesterday this blogger had to install Ubuntu on one of the older machines in the computer room. It's a 1U server without CDROM drive.
Read how it can be done here
machine is new enough to have two USB ports). This however proved impossible due to the BIOS lacking functionality to recognize and boot from USB CDROM drives. And the boot manager from Ubuntu doesn't recognize USB drives either. Dead end.
I did some research on this, and found several places where people were asking how to do, but no places where people actually got good answers.
The solution to my problem was to create a boot floppy with etherboot.