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Gentoo Failing to dual-boot from live USB with Windows 10
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MrHost56
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PostPosted: Thu Apr 27, 2017 1:21 am    Post subject: Gentoo Failing to dual-boot from live USB with Windows 10 Reply with quote

Hello,

I'm currently attempting to boot Gentoo from an external hard drive that made into a live USB (as per the instruction guide on the site) so that I can dual-boot from it when my laptop starts up.
I hold the escape key on boot up, and get to device selection screen. I've tried first selecting my USB as a startup device, which doesn't work, then I select to start from UFI(Or UEF, I can't remember at the moment), then I navigate to a folder labelled "boot" and select the amdx64.efi file.
No matter what I do I get the message "system boot image did not authenticate". I'm very new to Linux and don't know much about what I am doing. I had originally burned Xubuntu to the external drive using Rufus and Unetbootin as practice, and was successful. When I go to select the boot device I can still still the ubuntu option, even tho I burned the Gentoo .iso using Rufus.
I've also disabled secure boot, enabled legacy support, and disabled fast startup.
Doing this on an HP Omen, running with Windows 10 as mentioned in the title.

Any help with fixing this issue would be greatly appreciated, thanks in advance.
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saboya
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PostPosted: Thu Apr 27, 2017 1:38 am    Post subject: Reply with quote

You probably have to disable Secure Boot in your BIOS.

*edit* - I missed the part where you said you already did, I'm stupid.
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jmbsvicetto
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PostPosted: Thu Apr 27, 2017 7:49 pm    Post subject: Reply with quote

Unfortunately at this point, we still don't have UEFI boot working with the install-cd or the admin-cd.
For the time being, I suggest you use sysrescue-cd instead. To get it ready for booting from an usb, you can run isohybrid (part of sys-boot/syslinux) on the iso file (isohybrid -u <iso_file>) and write the iso to the usb device with dd.
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MrHost56
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PostPosted: Thu Apr 27, 2017 10:33 pm    Post subject: Reply with quote

jmbsvicetto wrote:
Unfortunately at this point, we still don't have UEFI boot working with the install-cd or the admin-cd.
For the time being, I suggest you use sysrescue-cd instead. To get it ready for booting from an usb, you can run isohybrid (part of sys-boot/syslinux) on the iso file (isohybrid -u <iso_file>) and write the iso to the usb device with dd.


Would I have to do this on a Linux distribution or could this be achieved on windows?
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DONAHUE
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PostPosted: Fri Apr 28, 2017 12:38 pm    Post subject: Reply with quote

Find out by creating System Rescue Bootable USB and booting it in UEFI mode. Can be created using Windows 10. https://wiki.gentoo.org/wiki/UEFI_Dual_boot_with_Windows_7/8 works well with windows 10. Adaptable to gentoo on a separate drive. Uses rEFInd which will find the usb drive when it is attached and will not have a problem when it is not.
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MrHost56
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PostPosted: Sat Apr 29, 2017 2:17 am    Post subject: Reply with quote

DONAHUE wrote:
Find out by creating System Rescue Bootable USB and booting it in UEFI mode. Can be created using Windows 10. https://wiki.gentoo.org/wiki/UEFI_Dual_boot_with_Windows_7/8 works well with windows 10. Adaptable to gentoo on a separate drive. Uses rEFInd which will find the usb drive when it is attached and will not have a problem when it is not.


Hey so I was following some instructions I don't know how I got to or even remember why I was following them in the first place.
However, I wound up mistakenly wiping my SSD when I thought I was applying something to my external hard drive. I didn't lose anything important, but now the disk is empty. Is it possible for me to just burn the .iso to my SSD? Or is this https://wiki.gentoo.org/wiki/UEFI_Dual_boot_with_Windows_7/8 The same process to do so?[/i]
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DONAHUE
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PostPosted: Sat Apr 29, 2017 12:29 pm    Post subject: Reply with quote

The usual technique would be to use the sysresccd usb as install media (to provide a running linux)) for the gentoo installation.
The sysresccd iso can be installed on the hard drive. I have not done so. The people who have done so, have reported that they use it as a handy recovery device not as a full blown gentoo system.
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MrHost56
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PostPosted: Sat Apr 29, 2017 9:08 pm    Post subject: Reply with quote

DONAHUE wrote:
The usual technique would be to use the sysresccd usb as install media (to provide a running linux)) for the gentoo installation.
The sysresccd iso can be installed on the hard drive. I have not done so. The people who have done so, have reported that they use it as a handy recovery device not as a full blown gentoo system.


Okay so I managed to COMPLETELY screw up my computer now. I have an eternal hard drive, is it possible for me to do a clean install of Gentoo from there with the .iso?
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DONAHUE
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PostPosted: Sun Apr 30, 2017 12:34 am    Post subject: Reply with quote

Does windows still boot and run?
Do you have a usb drive where you can install the sysrescuecd iso?
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doctor5
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PostPosted: Tue May 02, 2017 1:15 pm    Post subject: Reply with quote

I just wanted to add something about windows 10 and dual booting with rEFInd. The latest windows 10 update managed made the computer completely ignore rEFInd. I spent the better part of the day trying to fix this. The machine (a sony Vaio) was completely re-writing the UEFI entries, pushing rEFInd to the end. If I erased all of them (using a systemrescue usb image) and just kept rEFInd entry, it wrote new ones to boot windows 10!!

In the end I got rEFInd back when I 'de-installed' the windows update. I think was the 1607 update. I don't how much of the problem is windows 10 (I could double boot before but had problems after the update) or the bios in the computer (the bios must be looking for SOMETHING and then triggering the writing the NVRAM UEFI entries).

Windows 10 also made a new partition on the hard drive which meant I had to recompile the kernel to get the correct device into the boot command (I was using things like sda8..)

Very strange and I'm afraid of windows updates at this time.....
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DONAHUE
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PostPosted: Tue May 02, 2017 8:32 pm    Post subject: Reply with quote

As always, experiences vary. I run several rEFInd dual booting systems. All are now Windows 10 on the Windows side. Originally Windows 7 or 8 for some of them. So a lot of upgrades. Major upgrades of Windows 10 as well as Windows "upgrades" from 7 to 8 to 8.1 to 10 have purged rEFInd from the UEFI firmware as happened for you.
I use bcdedit from Windows to reestablish rEFInd by rerunning the step:
Code:
 bcdedit /set {bootmgr} path \EFI\refind\refind_x64.efi
from http://www.rodsbooks.com/refind/installing.html#windows . I adopted the bcdedit technique because my first UEFI motherboard would erase rEFInd from the UEFI if I used efibootmgr from Gentooto add it.
None of my Windows misadventures involved automatic repartitioning.
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doctor5
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PostPosted: Wed May 03, 2017 7:29 am    Post subject: Reply with quote

I have another machine that double boots linux and windows 7 quite nicely with refind and have no problems with it. Before the windows upgrade, the vaio worked quite nicely. It had come with win 8.1 (and I was double booting it with rEFInd) but the ssd died and when we replaced the drive, a new windows 10 was installed instead. It was working just fine double booting until the update at the end of april.

Tried bcdedit in windows. Didn't work.
Tried efibootmgr in linux. Didn't work.
Tried EasyUEFI in windows. Didn't work.

Tried the renaming hack from the refind web page. Sort of worked, but it became some mysterious two stage boot with a text menu at first, and then the rEFInd graphic screen. The partitions had been renumbered at that time, so linux didn't boot. I might try it again now that I have a recovery image for the windows install (that I can double boot) and I know the new partition numbering.

I'm not asking for a solution here, I just want to draw attention to this particular problem. There is definitely something mysterious here, and while it could be some mysterious interaction between my bios/firmware and windows 10, I don't expect the Gentoo forum to fix it. Surfing the net, I have seen that others have seen new partitions appear under windows 10.....
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