No bootable device detected after installing Gentoo and GRUB

Andrew12387306 · n00b Joined: 05 Oct 2024 Posts: 1

Greetings, comrades! After installing Gentoo via Chrooting into the stage3 tar package on a Linux Mint live USB and installing GRUB I get the following message when I try to power on my laptop:
NO BOOTABLE DEVICE DETECTED. INSERT BOOT DISK AND PRESS ANY KEY.

I installed grub by running the following commands (neither of which returned any errors):
grub-install /dev/nvme0n1
grub-mkconfing -o /boot/grub/grub.cfg

I also had the grub and efibootmgr packages installed.
Here is how my hard disk is partitioned: https://ibb.co/XSQDrFh

I've tried to reinstall grub, but the problem won't go away. As I understand it, I've messed something up with my grub installation.
If anyone here has any idea why this might be happening and how to fix it, please help.

lekto · Posted: Sat Oct 05, 2024 3:42 pm Post subject:

Try adding boot and esp flags to /dev/nvme0n1p1, what directories are on the nvme0n1p1?

NeddySeagoon · Posted: Sat Oct 05, 2024 4:14 pm Post subject:

Andrew12387306,

Welcome to Gentoo.
Your error message is from your PC firmware, not Gentoo.

The firmware cannot identify the ESP partition. From your screenshot, that looks like /dev/nvme0n1p1
You need the ESP flag set here but the flags column is blank.

Setting the flag will not harm the rest of your install.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.