Good evening,

First post here so please be gentle I've been using KDE on my work machine for about a year now and decided to make the switch on my home machine as well.

I have an existing Windows 10 UEFI (with secure boot) install with 3 existing windows primary partitions /dev/sdb and followed these steps during install.

- selected to manually set up partitions.
- created a new ext4 partition (/dev/sdb5) for the Neon install
- set the device for bootloader installation to /dev/sdb.

After installation completes and i restart i can see the option to boot to 'neon' but this pulls up a generic grub > prompt.
I have had success doing the same install with Ubuntu LTS and i get the grub bootloader giving me a list of bootable partitions however during ubunutu installation there's a specific options to 'install alongside existing windows instalation'.

I'm not sure if this is currently possible to do or whether there is some grub magic going on with the Ubunutu LTS install that i need to replicate manually with grub for the Neon install. Or perhaps i've installed the bootloader to the wrong device....

I have tried installing both with and without the 'disable secure boot' option with no success.

Any help with where to go from here would be greatly appreciated, i'm hoping i don't need a Masters Degree in grub to get this working.

You have a faulty configuration (obviously…).

A)

GrUB needs 2 things:

1/2)
The executable has to be installed into a
a) directory of the EFI System Partition (FAT file system)
b) of Your Boot-Disk (the disk Your hardware's firmware boots from).

2/2)
When GrUB is successfully executed, it looks for its configuration
file.

And:

B)
The configuration file needs a correct entry to boot the kernel.

###

There is a strong probability, that Your case is a faulty step 'B)'.

Reason being: 'neon' appears in Boot menu. Therefore: Config file
exists and is found. But because it doesn't boot, it must be wrong.

To help You to correct this, all info (A.1, A.2, B) is needed.

###

Easiest way to get at needed info:
Boot Grub
Select neon
Press 'e'
Post complete entry here.

Further steps depend on this info.

current iso is buggy, wait for new one.

https://bugs.kde.org/show_bug.cgi?id=383399

even if you do everything right, it will load into a grub prompt.
sadly there is no backup iso or something like that, so you will have to wait if they release a new iso. don't know when that happens though.