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I have bought a laptop (Lenovo ThinkPad T520) with a locked BIOS. So I can't change the boot order of the laptop. The upmost device in the boot order is the internal HDD. Fortunately there is a working Linux with Grub2 installed, which I have access to.
I also want to install Windows 10 now. How do I have to change the Grub2-configuration in order to be able to boot the Windows-installation from a Win10-Boot-Medium (ISO)?
Arch Linux Tux
Posted 2018-09-05T19:48:12.717
Reputation: 275
7
To boot the Win10-Image from your HDD:
/etc/grub.d/40_custom/boot/grub/grub.cfg with sudo cp /boot/grub/grub.cfg.bak. (Or add a number, if there already is a grub.cfg.bak.)sudo grub-mkconfig -o /boot/grub/grub.cfg.Grub2-configuration:
menuentry "Windows 10" --class windows --class os {
# Insert modules needed in order to access the iso-file
insmod part_gpt
#insmod part_msdos
insmod ntfs
#insmod ext2
# Insert module needed in order to find partition
insmod search_fs_uuid
# Set UUID of partition with the iso-image
# and let grub2 find the partition
# (save it's identifier to the variable $root)
set uuid="XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
search --no-floppy --set=root --fs-uuid $uuid
# Mount the iso image by addressing it with (partition)/path
set iso=/images/Win10_English_x64.iso
loopback loop ($root)$iso
# boot (chain-load) the image using the cdboot.efi file located
# on the win10-image
chainloader (loop)/efi/microsoft/boot/cdboot.efi
}
Instructions:
Replace XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX with the UUID of the partition, that holds the Windows 10 image.
insmod part_gpt: This module is needed, if the Win10-ISO-Image lies on a drive with a GPT-partitiontable.
insmod part_msdos: Choose this one over insmod part_gpt, if the image lies on a drive with DOS-partitiontable.
insmod ntfs: This module is needed, if the Win10-ISO-Image lies a NTFS-partition.
insmod ext2: Replace insmod ntfs with insmod ext2, when the image lies on a ext2/ext3 or ext4 partition.
Arch Linux Tux
Posted 2018-09-05T19:48:12.717
Reputation: 275
0
If you're using UEFI and only looking for a temporary solution (to run the installer), extract the Windows installer contents to a data partition (so it doesn't have a system on it). Make sure to have it at the top level, not in a folder, otherwise the installer fails to load. Then in GRUB enter the command line (c) and find the hard drive using ls, then enter chainloader (hdX,X)/efi/bootx64.efi and boot. This should boot into the Windows installer. After it finishes installing, you can delete the installer's files and folders:
autorun.inf boot bootmgr bootmgr.efi efi setup.exe sources support
NorbiPeti
Posted 2018-09-05T19:48:12.717
Reputation: 1
I have a system that boots in Legacy BIOS mode. I have an iso on an ntfs partition so I chose
insmod ntfsand choseinsmod part_msdos(and in a separate attemptinsmod part_gpt1) but I geterror: invalid signature` which my research shows has something to do with UEFI. WHich seems to relate to cdboot.efi. What should I use for legacy bios mode? – 0fnt – 2019-01-26T18:22:20.920@0fnt Take a look at: https://wiki.gentoo.org/wiki/GRUB2/Chainloading#Windows_.28MSDOS_based_boot_loaders.29 Try adding
– Arch Linux Tux – 2019-01-27T15:34:32.123insmod chainand replace the last line withchainloader (loop)+11https://superuser.com/users/352691/arch-linux-tux @arch-linux-tux Thanks- I tried it but I had the same
error: invalid signature. I even had secure boot disabled. For now I copied ISO contents to a partition and usedntldr /bootmgrbut if you do come across a solution- please do mention. Thanks – 0fnt – 2019-01-28T06:16:01.480this won't work in UEFI, it throws
not avalid root device– Wang – 2019-10-25T20:59:37.757