*SOLVED* Can't get it working under Nobara/Fedora 40

[hatesigningup]

Machine:
Microsoft Surface5
OS: Nobara Linux 40 (GNOME Edition) x86_64
Kernel: 6.12.10-203.nobara.fc40.x86_64
Shell: bash 5.2.26
Resolution: 2736x1824
DE: GNOME 46.6
WM: Mutter
CPU: Intel i5-7300U (4) @ 3.500GHz
GPU: Intel HD Graphics 620
Memory: 3390MiB / 7856MiB

Disk:
Disk /dev/nvme0n1: 238,47 GiB
Disklabel type: gpt
Device Start End Sectors Size Type
/dev/nvme0n1p1 2048 206847 204800 100M EFI System
/dev/nvme0n1p2 206848 255119359 254912512 121,6G Microsoft basic data
/dev/nvme0n1p3 255119360 257216511 2097152 1G Linux filesystem (/boot)
/dev/nvme0n1p4 496021504 500117503 4096000 2G Linux swap
/dev/nvme0n1p5 257216512 496021503 238804992 113,9G Linux filesystem (luks)

Grub:
GRUB_TIMEOUT_STYLE=
GRUB_DEFAULT=0
GRUB_DISABLE_RECOVERY='true'
GRUB_DISABLE_SUBMENU='true'
GRUB_ENABLE_BLSCFG='true'
GRUB_TERMINAL_OUTPUT='console'
GRUB_TIMEOUT='3'
GRUB_CMDLINE_LINUX_DEFAULT='quiet rd.luks.uuid=107a150b-5534-4887-bf84-9d44894ea5c0 splash'
GRUB_DISTRIBUTOR='Nobara Linux'
GRUB_FONT=/boot/grub2/fonts/unicode.pf2
GRUB_THEME="/boot/grub2/themes/tela/theme.txt"
GRUB_BACKGROUND="/boot/grub2/themes/tela/background.jpg"
GRUB_GFXMODE=1920x1080,auto

What I did:

1. Ran: sudo ./install.sh (no args), selected defaults and the installation semed to work but nothing on boot (just the usual micro-text grub2 bootlist.
2. Ran: sudo ./install.sh -b, Installed theme files into /boot/grub2/themes/tela/ still no theme on reboot.
3. Ran: sudo ./install.sh -g /boot/efi/EFI/fedora/ but still no menu.

Anyone know what I'm doing wrong here? Thanks.

[hatesigningup]

SOLVED

Found and followed this HowTo here:

https://discussion.fedoraproject.org/t/how-to-completely-reset-and-save-modifications-to-grub2/138097

First clean & reinstall grub2 by the instructions in the "Solved by Vlasislav Grigiryev" post:

sudo rm -f /boot/efi/EFI/fedora/grub.cfg
sudo dnf reinstall grub2-common
sudo grub2-mkconfig -o /boot/grub2/grub.cfg

Lastly I modified /etc/default/grub and added the changes given in the post by Ernest Boyd ernie-07, and added the missing/needed changes:

sudo vi /etc/default/grub

GRUB_TIMEOUT_STYLE=
GRUB_DEFAULT=0
GRUB_DISABLE_RECOVERY='true'
GRUB_DISABLE_SUBMENU='true'
GRUB_ENABLE_BLSCFG='true'
GRUB_TERMINAL_OUTPUT='gfxterm'
#GRUB_TERMINAL_OUTPUT='console'
GRUB_TIMEOUT='3'
GRUB_CMDLINE_LINUX_DEFAULT='quiet rd.luks.uuid=107a150b-5534-4887-bf84-9d44894ea5c0 splash'
GRUB_DISTRIBUTOR='Nobara Linux'
GRUB_FONT=/boot/grub2/fonts/unicode.pf2
GRUB_THEME='/boot/grub2/themes/tela/theme.txt'
GRUB_BACKGROUND='/boot/grub2/themes/tela/background.jpg'
GRUB_GFXMODE='1920x1080x32,auto'
GRUB_GFXPAYLOAD=keep

cd /boot/efi/EFI/fedora
su (had to su here, for some reason sudo wouldn't work!)
grub2-mkconfig > /boot/grub2/grub.cfg

Rebooted and the menu is now working perfectly :).

Regards.