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.
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have you tried holding Shift down during boot?– KatuSep 18, 2017 at 12:10
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Yes I did. It didn't work.– Cem ÖzenSep 18, 2017 at 12:22
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Related: askubuntu.com/questions/493612/how-to-reinstall-grub– Elder GeekSep 18, 2017 at 14:03
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1 Answer
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.