This question already has an answer here:

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

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.


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.

Not the answer you're looking for? Browse other questions tagged or ask your own question.