the final section of post linked below (titled: Prepare machine to serve UEFI properly) written by @Akito is what i used to find the correct settings and make sure i had everything set up correctly before my installation. if these settings are correct, your dvd should be able to properly install in uefi mode. i would still check with ls /sys/firmware as @Tech_JA has suggested here to make sure it has also booted in uefi mode just to make sure before continuing with the installation 
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