[SOLVED] Windows 10 / CentOS 7 will not dual boot

pan64 · 02-15-2022, 12:29 PM

Quote:

Originally Posted by walterbyrd

Maybe I would do better with something more recent? Rocky Linux, Oracle Linux, Fedora, or Stream CentOS?

No, you need to fix that grub error. I think it is just a typo:

Code:

grub2-mkconfig -o / boot/grub2/grub.cfg
                   ^ no space here, should be
grub2-mkconfig -o /boot/grub2/grub.cfg

colorpurple21859 · 02-15-2022, 12:38 PM

I fixed the typo, sorry about that.

walterbyrd · 02-15-2022, 03:16 PM

Quote:

Originally Posted by pan64

No, you need to fix that grub error. I think it is just a typo:

Code:

grub2-mkconfig -o / boot/grub2/grub.cfg
                   ^ no space here, should be
grub2-mkconfig -o /boot/grub2/grub.cfg

Code:

# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-1160.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-1160.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-1495fd8baa4e4037ace10e1effc2d33a
Found initrd image: /boot/initramfs-0-rescue-1495fd8baa4e4037ace10e1effc2d33a.img
Found linux image: /boot/vmlinuz-0-rescue-f88f9bcae7074473912b27834c137add
Found initrd image: /boot/initramfs-0-rescue-f88f9bcae7074473912b27834c137add.img
done

Did that. Then I did a full shutdown. Then restarted. Sadly, still will not dual boot.

colorpurple21859 · 02-15-2022, 03:55 PM

Did you add the osprober line to /etc/default/grub

walterbyrd · 02-15-2022, 04:26 PM

Quote:

Originally Posted by colorpurple21859

Did you add the osprober line to /etc/default/grub

Yes.

Code:

GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto rhgb quiet"
GRUB_DISABLE_RECOVERY="true"
GRUB_DISABLE_OS_PROBER=false

Maybe I should re-install grub?

colorpurple21859 · 02-15-2022, 07:31 PM

add this to /etc/grub.d/40_custom

Code:

menuentry 'Windows' --class windows {
set root=(hd0,1)
ntldr /bootmgr
boot
}

rerun

Code:

grub2-mkconfig -o /boot/grub2/grub.cfg

walterbyrd · 02-16-2022, 12:06 PM

That seemed to do it. Thank you. I will mark this solved.

colorpurple21859 · 02-16-2022, 12:49 PM

You're Welcome

pan64 · 02-16-2022, 01:44 PM

Quote:

Originally Posted by colorpurple21859

add this to /etc/grub.d/40_custom

Code:

menuentry 'Windows' --class windows {
set root=(hd0,1)
ntldr /bootmgr
boot
}

What a magic. Interesting, for me grub works without this.

colorpurple21859 · 02-16-2022, 03:01 PM

Works for me too, however, every so often there is a thread about grub not finding windows.

walterbyrd · 02-19-2022, 08:43 PM

I have only had this problem with RHEL and CentOS. Grub seems to work in other distros.