#[SOLVED] How can I add my secondary OS to the GRUB bootloader?

123 messages · Page 1 of 1 (latest)

cunning tundra
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I'm currently dualbooting both Windows 10 and Arch (Out of necessity), and the GRUB isn't loading the Windows option when I first start the machine
Documentation, tutorial or whatever is fine

wind bear
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did you have os-prober installed and the windows boot partition mounted when running grub-install?

snow jay
wind bear
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well, of course; it is the relevant archwiki page (:

snow jay
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Here's a question to actually start: UEFI or BIOS boot?

gloomy moat
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after reading it, it sucks

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looks about right

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most firmware will auto detect windows so u can probably still boot to windows from ur firmware (uefi/bios) boot menu

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edit due to cannot london

cunning tundra
cunning tundra
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I uncommented the OS-prober and installed it, but it didn't seem to work for some obscure reason

wind bear
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Try this:

For Windows installed in BIOS mode, mount the Windows system partition (its file system label should be System Reserved or SYSTEM). Run os-prober as root to detect and generate an entry for it.

cunning tundra
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Icic, I'll try it

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Just one second

wind bear
cunning tundra
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Done and rebooting

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Aaand it isn't detected

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Windows is already installed on the the correct partition, but it just seems to not recognize it

wind bear
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might need to do grub-mkconfig after that

cunning tundra
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Perhaps I did something wrong

wind bear
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does running sudo os-prober do anything though?

cunning tundra
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It did run but didn't return anything, nor add Windows to the bootloader

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And I was running as sudo

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Root*

wind bear
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:(

cunning tundra
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I would be mildly annoyed if I lost all my Windows files

wind bear
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why would you? unless you deleted them
not booting is something else.

cunning tundra
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Rebooted adt

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After running mkconfig, still no Windows

snow jay
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ls /sys/firmware/efi check if this exists if you're not entirely sure which boot mode you're in, if it exists, then UEFI mode.

cunning tundra
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No such file, it's BIOS

snow jay
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ah cool

wind bear
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lsblk -f to check your disk and OS setup.
to make sure you are mounting correctly before grub-mkconfig

cunning tundra
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Lemme take a pic, since I can't really copy it

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sda2 is where windows is supposed to be in

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Sda1 being system reserved

wind bear
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uhmm, where is your Arch? :D

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oh sda3

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and is sdb1 the boot partition??

cunning tundra
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I presume so

wind bear
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so how are you running grub-mkconfig?

cunning tundra
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Oh no

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It's my USB stick

wind bear
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yeah

cunning tundra
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Mb

wind bear
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i see no boot partition at all on your system

cunning tundra
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Guess I skipped something on the wiki by accident then

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So, back to wiki and reinstall grub like normal?

wind bear
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how are you booting into Arch?

cunning tundra
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It boots like normal, just doesn't detect Windows

wind bear
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as apparent, you were able to boot

cunning tundra
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Well, any ideas? I'm still quite clueless about how this works in general

wind bear
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can you boot without your usb plugged in?

cunning tundra
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NTFS partitions may not always be detected when mounted with the default Linux drivers. If GRUB is not detecting it, try installing NTFS-3G and remounting.

cunning tundra
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Yeah, I can

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For Windows installed in BIOS mode, mount the Windows system partition (its file system label should be System Reserved or SYSTEM). Run os-prober as root to detect and generate an entry for it.

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Perhaps this?

wind bear
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well yes, you said you tried that

cunning tundra
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I did

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I'll retry

wind bear
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but where the hell is your grub (boot partition) ??

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without the boot partition mounted to /boot, it won't do anything

cunning tundra
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I did as the guide stated and mounted it in sda(?)

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On the disk, that is

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OH?

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I think I know what happened?

spark hedge
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Probably using windows' efi system partition

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Which is the right way

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Oh wait

cunning tundra
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I might have built it inside sda3, perhaps? I did it on arch-chroot

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Dunno if that's a hint of what might have happened

spark hedge
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Where tf is the windows efi partition

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im confused

wind bear
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i am too :D

cunning tundra
wind bear
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it is bios / mbr i think

cunning tundra
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It is BIOS

spark hedge
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Ah

wind bear
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which is foreign to me but seems fine

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now that i checked it

cunning tundra
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Soo, bad sign?

wind bear
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not necessarily

cunning tundra
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Yeah I can fly with that, what should I do from now on?

wind bear
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can you do ls -alt /boot

cunning tundra
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Is it readable?

kind cradle
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yes

wind bear
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ok, can you mount sda1 somewhere, anywhere

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to /mnt maybe

cunning tundra
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I don't quite follow, can you be more explicit?

wind bear
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ls /mnt
does it exist?

cunning tundra
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No output

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So I presume not?

wind bear
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mount /dev/sda1 /mnt

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no output with plain ls means it exists and it's empty

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what exact command do you use for grub-mkconfig?

cunning tundra
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mount: /mnt: unknown filesystem type 'ntfs'

cunning tundra
spark hedge
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You need to specify the type for ntfs

cunning tundra
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Fetching it, just a second

wind bear
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mount -t ntfs3 -o force /dev/sda1 /mnt

cunning tundra
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Mounted

wind bear
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ok

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grub-mkconfig -o /boot/grub/grub.cfg

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any output about detecting windows?

cunning tundra
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Rebooting

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Yeee it worked

wind bear
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don't hurry :d

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haha nice

cunning tundra
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Thanks for holding my hand through this one

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🫂

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Is there any thanks system on this server or smth?

wind bear
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it doesn't mean anything, but replying to someone's message with "thanks" in the reply gives some cookies

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... solved

blissful knotBOT
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cunning tundra
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[SOLVED] How can I add my secondary OS to the GRUB bootloader?

scarlet bison