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I had not any problem dual booting ubuntu before. Once I opened BIOS the dual boot menu was gone. It directly boots Windows now. I didn't change anything in BIOS. How can I fix this? Thank you.

marked as duplicate by karel, Eric Carvalho, Zanna, Charles Green, Thomas Ward Dec 12 '18 at 19:28

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Try booting from an Ubuntu USB and installing Boot-Repair. You will need a persistent install for this, I think (haven't tried downloaded Boot-Repair onto a USB before). Try the "Recommended repair" first. If this doesn't work, you will be able to use the app to create a BootInfo summary that you can post here which will make it easier for others to solve your problem.

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