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Can't get Window 7 to boot with grub2
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andrewwalker27
l33t
l33t


Joined: 27 Jun 2005
Posts: 612

PostPosted: Thu Mar 01, 2018 12:25 am    Post subject: Can't get Window 7 to boot with grub2 Reply with quote

I'm having trouble getting Windows 7working with grub 2. I originally had Gentoo on a removable hard drive and Windows 7 on another and just swapped them out when it suited. I did this mostly because I didn't want Windows to nuke linux and grub but now I want them to be selectable through grub2.
My system is set up as follows, Gentoo on sda and Windows 7 on sde and a unused old Windows 10 partition on sdb. It seems grub2 seems to find them both
Code:
localhost /home/fred # os-prober --target=fs_uuid /mnt/windows7/bootmgr
  WARNING: Failed to connect to lvmetad. Falling back to device scanning.
/dev/sdb1:Windows 10:Windows:chain
/dev/sde1:Windows 7:Windows1:chain
localhost /home/fred #

and when I update grub they both seem to setup ok. Ignore the Windows 10 partition, it's redundant and going to be reformatted.
Code:
localhost /home/fred # os-prober --target=fs_uuid /mnt/windows7/bootmgr
  WARNING: Failed to connect to lvmetad. Falling back to device scanning.
/dev/sdb1:Windows 10:Windows:chain
/dev/sde1:Windows 7:Windows1:chain
localhost /home/fred #

I'm assuming the WARNING isn't anything to worry about.
When I try to start Windows 7 I get an error, something about a missing bootmgr but if I boot into Windows 7 directly from BIOS using F8 it works perfectly. Annoyingly the redundant Windows 10 partion boots correctly, I've looked at this guide here https://wiki.gentoo.org/wiki/GRUB2/Chainloading and saw the bit at the end marked important about bootmgr but don't quite understand how to fix it. Do I need to boot of my Windows 7 cd and fix it and is that likely to then murder my grub setup? Surely if this was the issue, Windows 7 wouldn't boot through the F8 method?
I've also tried editing /etc/grub.d/40_custom but get the same error.
I'm using an old motherboard pre-UFEI and grub-2.02 if that helps.
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audiodef
Watchman
Watchman


Joined: 06 Jul 2005
Posts: 6233
Location: /usr/lib64/lv2

PostPosted: Thu Mar 01, 2018 3:38 pm    Post subject: Reply with quote

It's ok to murder your grub setup. Go ahead and fix Windows, then grab your favorite boot medium - sysresccd, livecd, whatever - chroot into your Gentoo system and run grub-install and grub-mkconfig.

I've had to do this now and then. It's annoying, but not hard to fix.
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