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I have installed Ubuntu 20.04 (sdb3) on a Separate Disk from Windows EFI (sda2) and I think I messed up the installation and now when reboot is going straight into Ubuntu.

I tried so far: re-start with (right) Shift to go into the Grub start up but not working, recommended repairs from boot-repair but no luck this is the feedback https://paste.ubuntu.com/p/D5ShBq39hb/, on boot-repair advanced Grub location I tried to change the boot default to Windows (via sdb3 menu) and un-clicked the Separate efi from sda2, but it says a GPT is detected, and I am not sure how to create a BIOS-Boot partition with Gparted.

Any help would be greatly appreciated.

MarianD
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Mcavalca
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2 Answers2

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Open the terminal and edit the grub file:

sudo nano /etc/default/grub

Modify the file with this line: GRUB_DISABLE_OS_PROBER=false, save the changes and exit using Ctrl+o followed by Enter and Ctrl+x.

sudo update-grub

Then reboot.

Kevin Bowen
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Tosha Tumanov
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I managed to get into the BIOS/EFI, turns out that the Nvidia NS 310 GPU really messed up the functioning of the EFI, once removed, with a simple F10 I managed to switch the order of the Disk and Boot with Windows, and delete the Ubuntu install and start again. As a post morten the mistakes were: 1) the Ubuntu 20.04 I had put in the USD Stick was Bios Legacy/MBR instead of EFI/GPT, i should have paid attention on the formatting on Rufus 2) Do not try to be to cute on the installation let Ubuntu install it on the same drive of Windows if possible otherwise things get messy really quickly. Many thanks ubfan, oldfred amd Tosha, great to see that people take interest in helping.

Mcavalca
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