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Dual boot and bios option not coming after installing dual boot

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I recently installed ubuntu with dual boot without any usb or pendrive by watching a YouTube tutorial. But Now I can only use my ubuntu os. No dual boot option shows when I start the computer. Not even my mother board logo. Only black screen comes and after that ubuntu logo shows and the os start. How can i fix this issue?

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Please read [ask] then [edit] your question accordingly not least of which with information about the version of ubuntu and the resource you refer to.
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