I've made a dual boot in a Dell Optiplex 7020 with a existing Windows 10. Now Ubuntu is booting directly, grub doesn't seems to load (or if it loads it doesn't show nothing in the menu) and I can't access BIOS/UEFI. Dell logo doesn't appear anymore and using the keys that I used before doesn't do nothing. Also, I can't boot from a USB stick as I can't do anything with BIOS/UEFI. I have no clue what can be done...


On start up press f8. Grub will appear then. You can choose system settings or advanced setting (I forget the menu name). You will enter uefi bios from there.

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  • This solution worked best for me, even if I can't enter uefi or bios through terminal, I can do it the manual way. – wanderer0810 Dec 30 '17 at 7:18

First you need to start grub with command grub in a terminal. This allows you to see what grub does and how it starts up all the systems.

Then run root (hd -then hit the <Tab> key to auto-complete. once you are logged into grub. This will show you a number of disk options, and once you select the disk you want, with a command looking like this grub> root (hd0, you should be able to see all the partitions of the harddisk selected.

For a list of all commands look here: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/3/html/Reference_Guide/s1-grub-commands.html and use what is required to modify what you startup.

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