Friends, I used W10 64bits UEFI and decided to install a Debian distro Metamorphose on separated partition sd5(windows sd4... other sdx as windows std setup) - grub on sda. After installation I cannot look for windows on grub and seems because was installed into UEFI and Linux on Legacy. Command os-prober do not show nothing and parted -l output

Model: ATA SAMSUNG SSD PM87 (scsi)
Disk /dev/sda: 256GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number Start End Size File system Name Flags
1 1049kB 473MB 472MB ntfs Basic data partition hidden, diag
2 473MB 578MB 105MB fat32 EFI system partition boot, esp
3 578MB 595MB 16,8MB Microsoft reserved partition msftres
4 595MB 203GB 202GB ntfs Basic data partition msftdata
5 203GB 253GB 50,3GB ext4 msftdata
7 253GB 255GB 2098MB linux-swap(v1)
6 255GB 256GB 867MB ntfs hidden, diag

Anyone can help to setup dual boot to W10 and Linux. Already tried some posts including https://www.linuxquestions.org/quest...pt-4175538259/ and https://www.linuxquestions.org/quest...rt-4175615852/ without success !

You should install your distro in UEFI mode.

Thanks & understand Keruskerfuerst. BIOS under UEFI=enabled, security boot=disabled, boot sequence=External USB Drive ... cannot read DVD. Only if I set Legacy. Metamorphose is UEFI mode according to provider and I used Legacy to install and this may be the issue. I cannot read Distro DVD with UEFI model selected.

Then the DVD ROM is not capable of UEFI mode.
A more modern blu ray drive will read in UEFI mode (UEFI shell).

Thanks for your reply.
After check DVD spec you are correct. I have installed distro via pendrive. No issues and installation was normal. Tks

Which spec are you talking about ? The previous post does not make sense as all optical drives are simply SATA block devices.

...After check DVD & Spec you are correct ....

based on: https://www.howtohaven.com/system/bo...dows-8-1.shtml

Anyway, solved by using pendrive instalation.

The blog you linked to is not an actual DVD specification. It mentions secure boot and the need to have DVD discs digitally signed. It has nothing to do with the DVD hardware player just the content on the disc.

Therefore the previous comments,

don't make any sense as it has nothing to do with the player just with whether a given disc is digitally signed.