How can I add USB /CD ROM boot option to boot menu

Vivek_20

Commendable
Dec 5, 2016
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1,510
Dell Inspiron 153521 is my device and I would like to dual boot it with Ubuntu but I failed to find any option for us /CD ROM booting in boot menu then how can I boot with new OS or how can I add those boot option to boot menu please help
 

Tracy_32

Commendable
Feb 1, 2017
1
0
1,510