Executing Grub-install /dev/sda error during installation

Asked by Cikitta Tjok on 2021-01-12

I was using Windows 10 OS, and wanted to install Ubuntu alongside my current OS. I used Rufus to create the bootable USB, with default settings. However, that option is missing so I clicked "something else"* option and install Ubuntu manually. Then, an error pop-up shows saying "Executing Grub-install /dev/sda failed, this is a fatal error". I tried to do reboot and it says "Ubuntu boot failed". Then I tried to mess with BIOS setting and now my BIOS setting won't even recognize my Windows as an operating system. Ubuntu actually once recognized my Windows and "broken" Ubuntu. I boot again from my bootable USB and this time it didn't recognize my Windows anymore. I tried to replace my "broken" Ubuntu with the new one from my bootable USB but same problem occurred again. What should I do to either install Ubuntu properly or bringing Windows back without any problem?

*Here are my something else settings:
- Root with 30 GB of space;
- Home with 100 GB of space;
- Swap with 9 GB of space;
- EFI with 1 GB of space.

Other information:
- Ubuntu version: 20.04.1 LTS
- I have 500 GB hard drive disk and I don't have unallocated space anymore, the Installer took all the spaces :(
- My Windows boot type/mode is Legacy
- I can't find secure boot setting on BIOS
- I don't want two OS's anymore.. I don't mind If I need to fully wipe my disk, I prefer using Linux actually
- I am now running my bootable USB since I can't boot into any installed operating system
- I am not a tech-savvy.. I'm a new Linux user

Question information

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Bernard Stafford (bernard010) said : #1

Feel free to re open question if you need more information

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