thanks for the prompt reply

On Wed, Dec 23, 2015 at 6:32 AM, maderios <maderios@gmail.com> wrote:

Hi
Why an extended partitition?

I just marked the normal partition flag instead of LVM, is there any practical and related issue with my problem in this?

It should a gpt partitioning with efi. Your 'Dell Precision m6800' uses uefi but you have not any efi partition
http://www.manualslib.com/manual/563583/Dell-Precision-M6800.html?page=58
For me, your install is wrong. First, You have to disable uefi secure boot in your bios, then install F23. Installer has to detect an efi partition like '/boot/efi'

uhm, I' ve checked and in what should be the /boot dir I' ve

efi

|-->EFI

|-->BOOT

|-->BOOTX64.EFI

|-->fallback.efi

|-->fedora

|-->BOOT.CSV

|-->fonts

|-->unicode.pf2

|-->gcdx64.efi

|-->grubx64.efi

|-->MokManager.efi

|-->shim.efi

|-->shim-fedora.efi

|-->mach_kernel

|-->System

|-->Library

|-->CoreServices

|-->SystemVersion.plist

as far as I know everything is there or is it not?

I've also checked the options related to UEFI in my BIOS and seems that UEFI and Secure boot are both disabled.

This are the related options:

General

Boot Sequence

Legacy (this flagged)

UEFI (this is not flagged)

Advanced Boot Options

Enable Legacy Option ROMS (this is selected and the note says "This option is not allowed if secure boot is enabled")

System Configuration

Integrated NIC

Enabled UEFI Network Stack (this is not flagged)

Enabled w/PXE (this is flagged)

Secure Boot

Disabled (flagged)

Could be that I missed something? Any other idea?

Walter