I recently set up a dual boot with Ubuntu and Windows, but I'm facing an issue where it boots directly into Ubuntu without displaying the GRUB menu. I've already tried a few things:
1. When I change the boot priority in BIOS to Windows, it boots into Windows directly.
2. I've modified the GRUB settings to set the timeout style to menu and the timeout to 10 seconds.
3. I used boot-repair to try to fix it.
Despite all these attempts, the GRUB menu still doesn't show. Does anyone have any suggestions for what might be causing this?
3 Answers
I had a similar issue, and uncommenting the line `GRUB_TERMINAL=console` in the GRUB configuration file seemed to solve the problem for me.
Remember, the `os-prober` detects other operating systems and configures GRUB for them. Some distributions might not have `os-prober` enabled by default, so check that setting!
Have you checked a few things? First, ensure the `os-prober` feature is enabled in your GRUB settings. Also, did you remember to run the `update-grub` command after making changes? It's important that both your Ubuntu and Windows installations are using the same booting mode, either UEFI or legacy; if they don't match, GRUB will skip the other OS. If GRUB isn't behaving, you might consider installing rEFInd as an alternative boot menu. Also, when you boot, does GRUB show at all, or does it skip directly to Ubuntu? You could try increasing the timeout to 60 seconds temporarily to see if that helps you verify that GRUB is actually starting up.
Using a second monitor didn't show anything either.
I've set `os-prober` to false, but it actually detects Windows fine. I update GRUB after every change. Both systems are using UEFI. Increasing the delay shows that GRUB likely starts but doesn't display. I'll try plugging in an external monitor to see if that helps!