Dell latitude 6430u boot order issue

Got a new Dell laptop from company and first thing I saw that it came with a external usb pluggable DVD drive. I inserted a ubuntu CD in it and rebooted the computer. I pressed F2 to change boot order to DVD and then USB and then HDD. After restarting it wont boot from ubuntu CD. I tried various options but then gave up.

Suddenly I realized about F12 so i rebooted and pressed F12 during boot and from there when I chose DVD it worked fine.

God knows what issue it was but it seems either I am missing something very minor or Dell BIOS is missing something major.

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