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Old 05-29-2017, 06:08 PM   #1
binary.druid
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Registered: Oct 2008
Location: Toronto, ON
Posts: 3

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Trying to get Grub2 to see the Windows 7 partition.


Hi Guys, 1st off, I'm new to CentOS, but not new to computers.

I just installed CentOS 7.3 on my system and the Grub menu is not displaying the Window7 instance I have on a different drive. If I try to update the Grub2 config file by running the command:
Code:
grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg
I get the following error message:
Code:
/etc/default/grub: line 3: 7: command not found
Can you guys shed some light into what I'm missing?

I've verified that the Package os-prober-1.58-9.el7.x86_64 is already installed. if I CAT /etc/default/grub, I get the following output:
Code:
    GRUB_TIMEOUT=5
    GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
    GRUB_DEFAULT=Windows 7
    GRUB_DISABLE_SUBMENU=true
    GRUB_TERMINAL_OUTPUT="console"
    GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=cl/root rd.lvm.lv=cl/swap rhgb quiet"
    GRUB_DISABLE_RECOVERY="true"
I'm guessing it's referring to the "GRUB_DEFAULT=Windows 7"??? I'm not sure what it's looking for here or how to fix this? I've read different posts that indicate to not touch this file, and that the "grub2-mkconfig" command will make the changes... which brings me back right to where I started.

For the record, I haven't changed or modified anything at this point, and If this helps, the "40_custom" file shows:

Code:
    #!/bin/sh
    exec tail -n +3 $0
    # This file provides an easy way to add custom menu entries.  Simply type the
    # menu entries you want to add after this comment.  Be careful not to change
    # the 'exec tail' line above.
    menuentry "Windows 7" {
            set root=(hd0,1)
            chainloader +1
            }
Uname = Linux LX-WkSt 3.10.0-514.16.1.el7.x86_64 #1
CentOS Linux release 7.3.1611 (Core)
 
Old 05-29-2017, 08:43 PM   #2
jefro
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See this to start. https://wiki.centos.org/HowTos/Grub2

A lot really going on with your question too.

Can I assume that you had windows 7 running and you just now installed Centos?

Is the system uefi really?
Was windows 7 running under uefi?
Is it possible that you copied over the windows loader?
 
Old 05-31-2017, 06:52 PM   #3
binary.druid
LQ Newbie
 
Registered: Oct 2008
Location: Toronto, ON
Posts: 3

Original Poster
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@Jefro, All great questions there. I will attempt to answer the best that I can:

Can I assume that you had windows 7 running and you just now installed Centos? Yes.

Is the system uefi really? I think so. Is there a way I can confirm ?

Was windows 7 running under uefi? I think so. Is there a way I can confirm ?

Is it possible that you copied over the windows loader? I don't believe so. Is there a way I can confirm ?

Thank you for the provided link. Hopefully it will answer my questions.


-BD
 
Old 05-31-2017, 06:59 PM   #4
syg00
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Registered: Aug 2003
Location: Australia
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I would be guessing you need double quotes on that line to protect the space character. Very unusual for it to be generated like that. If you really didn't change it, raise a bug against CentOS.
That is one of the grub files you can safely change and have retained.
 
Old 05-31-2017, 09:52 PM   #5
yancek
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Registered: Apr 2008
Distribution: PCLinux, Slackware
Posts: 9,393

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Windows 7 default install would be the older MBR/CSM rather than UEFI so unless you installed UEFI, it probably is not.
If you have one system UEFI, they both should be or you will have boot problems. If one is MBR, they should both be. If you can boot CentOS, do that and run as root:

Quote:
fdisk -l
(Lower CAse Letter L in the command) and post the output here. You should also check to see if you have an EFI partition and on which disk and whether you have both windows and Linux efi files on it.

Last edited by yancek; 05-31-2017 at 09:53 PM.
 
Old 06-01-2017, 06:51 AM   #6
sum1nil
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Registered: Jun 2013
Posts: 8

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A temporary solution may be to use www.supergrubdisk.org/super-grub2-disk/.
You put it on a USB stick and boot from that. It also has diagnoses software. I used it after a reinstall of Windows overwrote grub.
 
  


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