I’m building a desktop to dual-boot Leap 42.3 and W10.
Windows 10 is already installed in UEFI/secureboot mode and shrunk to half the SSD size, for Leap installation.
SSD is a Samsung 840 Evo, updated with the latest firmware. It currently has 4 gpt partitions created by windows 10, as reported by gparted:
/dev/sda1 450 MB NTFS (recovery) /dev/sda2 99 MB EFI system partition /dev/sda3 16 MB MS reserved partition (file system unknown) /dev/sda4 100 GB NTFS Basic Data partition 132 GB unallocated space.
MoBo is a Gigabyte H81M-H (LGA 1150) with latest firmware, rev. F9 (08/11/2015).
Relevant BIOS settings, AFAIU, are currently this:
Boot Option #1: Windows Boot Manager (on SATA0 SSD) Execute Disable Bit: Enabled Windows 8 Features: Windows 8 CSM Support: Always Boot mode Selection: UEFI only Storage boot Option Control: UEFI First Other PCI Device ROM Priority: UEFI OpROM info only: System Mode State: Setup info only: Secure Boot State: **Disabled**
I don’t understand this last line, as right below there are the following settings:
Secure Boot: **Enabled** Secure Boot Mode: Standard
Time is set to local in BIOS, and shown correctly in W10.
SSD is a Samsung 840 Evo, updated with the latest firmware.
There’s also a 1TB HDD with a backup of the previous oS 42.1 /etc and /home folders, that I intend to selectively restore to the SSD (nfs shares, thunderbird and FF folders, etc).
This HDD has 209 GB unallocated space at the beginning and a /dev/sda4 XFS partition with the backup and a lot of work data I need to keep. It’s partition table is msdos, not gpt. The unallocated space previously housed three partitions of the previous oS 42.1 install.
My main concern is to avoid damaging the Windows installation, as it houses a suite of bought-and-paid-for expensive software that are a PITA to reinstall, with multiple harware/IP locks. One of them (SAP2000) broke in a test W10 VM and it took 2 months to get it authenticated again, due to the very severe lock-down the publisher sees fit to use. Even de-authenticating it was fraught with pitfalls. Also transferring W10 and Office 2016 took a lot of comings and goings with MS support.
My intention is to install LEAP from the DVD, set to UEFI in the BIOS. I intend to disable the HDD in BIOS during installation, so the installer will only see the SSD.
So I’d like to ask for help on the following concerns I have:
**1) **Where (which partition) should the grub2 bootloader be installed on /sda? And the boot flag? The default installation settings should work?
**2) **Can I partition the HDD unallocated space at the beginning as one partition only (either NTFS for W10 drive D or an additional linux FS for data), so there’d be only /sdb1 and /sdb4 or the missing /sdb2 and /sdb3 will cause problems?
3) **Secure boot is enabled or not? What’s better for this work machine?
There. A long preamble for a few questions