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enrico68
Apprentice
Joined: 21 Oct 2016
Posts: 169
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 Posted: Sun Nov 13, 2016 11:27 am Post subject: Problem with dual boot |
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Hello,
I spent the last few hours trying to dual boot into Windows 10 and Gentoo. I installed the os-prober, and, in /etc/grub.d/40 I entered the following lines:
| Code: | menuentry 'Windows 10' {
set root='hd0,1)'
chainloader +1
}
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Now, when I boot my PC, the Windows 10 line is there, but I get the message: no hd0, msdos1 found... and /grub/x86_64-efi/part.mod not found...
The two OS are installed on two separate disks, Windows 10 with an msdos partition, and Gentoo with a GPT partition. It is evident my solution is not correct,
I already tried to run
| Code: | | emerge --ask --newuse sys-boot/os-prober |
and, when running:
| Code: | | grub-mkconfig -o /boot/grub/grub.cfg |
I get:
| Code: | tux erpino # grub-mkconfig -o /boot/grub/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.4.26-gentoo
Found linux image: /boot/vmlinuz-4.4.26-gentoo.old
done |
with no Windows 10 to show.
I hope someone can shed a light on this, as I am curious to see what the solution is.
enrico |
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Hu
Moderator
Joined: 06 Mar 2007
Posts: 21630
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| Posted: Sun Nov 13, 2016 3:37 pm Post subject: |
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| That unbalanced parenthesis looks wrong to me. I have not used grub in a long time, but from what I remember, its syntax should be (hdN,M) where N and M are numbers appropriate to the drive and partition you want to use. |
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DONAHUE
Watchman
Joined: 09 Dec 2006
Posts: 7651
Location: Goose Creek SC
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| Posted: Sun Nov 13, 2016 6:51 pm Post subject: |
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agree about parentheses
did you run os-prober after you emerged it?
with the boot partition mounted at /boot, run | Code: | | os-prober | wgetpaste -t |
post url returned. If that does not produce a reference to a microsoft OS, try | Code: | emerge ntfs3g
mkdir /mnt/win
mount /dev/sda2 /mnt/win
os-prober | wgetpaste -t
grub-mkconfig -o /boot/grub/grub.cfg
wgetpaste -t /boot/grub/grub.cfg |
post url's
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enrico68
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Joined: 21 Oct 2016
Posts: 169
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| Posted: Sun Nov 13, 2016 10:01 pm Post subject: |
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Hi DONAHUE,
| Quote: | | agree about parentheses |
The parentheses is there, I must have missed it while typing.
| Quote: | | did you run os-prober after you emerged it? |
I did run | Code: | | grub-mkconfig -o /boot/grub/grub.cfg |
after emerging os-prober.
| Quote: | with the boot partition mounted at /boot, run | Code: | | os-prober | wgetpaste -t |
post url returned. |
I ran it, but there is nothing to read. I am doing it not from the sysrsccd, but from my Gentoo hard disk.
If that does not produce a reference to a microsoft OS, try
| Code: | emerge ntfs3g
mkdir /mnt/win
mount /dev/sda2 /mnt/win
os-prober | wgetpaste -t
grub-mkconfig -o /boot/grub/grub.cfg
wgetpaste -t /boot/grub/grub.cfg |
post url's
I did the first part, "emerge ntfs3g, and then I stopped. I have sda with Windows, and sdb with Gentoo. Is the :mount /dev/sda2 /mnt/win correct, given my disk setup?
enrico
edit: I just checked | Code: | | grub-mkconfig -o /boot/grub/grub.cfg |
, and I get an error: | Code: | | /usr/sbin/grub-mkconfig: line 235: /boot/grub/grub.cfg.new: No such file or directory |
.
This is where that line 235 is:
| Code: | if test "x${grub_cfg}" != "x"; then
rm -f "${grub_cfg}.new"
oldumask=$(umask); umask 077
exec > "${grub_cfg}.new. |
I think this has to be fixed first, before we go any further...
enrico
Last edited by enrico68 on Sun Nov 13, 2016 10:34 pm; edited 2 times in total |
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enrico68
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Joined: 21 Oct 2016
Posts: 169
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| Posted: Sun Nov 13, 2016 10:10 pm Post subject: |
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| Hu wrote: | | That unbalanced parenthesis looks wrong to me. I have not used grub in a long time, but from what I remember, its syntax should be (hdN,M) where N and M are numbers appropriate to the drive and partition you want to use. |
I have Windows 10 on sda, and the boot partition is the first one of that disk, that is why I entered (hd0,1).
enrico |
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DONAHUE
Watchman
Joined: 09 Dec 2006
Posts: 7651
Location: Goose Creek SC
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| Posted: Sun Nov 13, 2016 11:01 pm Post subject: |
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Good, but Hu is trying to point out that | Quote: | menuentry 'Windows 10' {
set root='hd0,1)'
chainloader +1
} |
should likely be | Quote: | menuentry 'Windows 10' {
set root='(hd0,1)'
chainloader +1
} |
since most programming languages require an opening ( for every closing )
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enrico68
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Joined: 21 Oct 2016
Posts: 169
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| Posted: Mon Nov 14, 2016 6:18 pm Post subject: |
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Hi DONAHUE,
I think you are referring to the parenthesis before "hd0,1", where I show "hd0,1)"; but it should be "(hd0,1)". If this is it, it's in there, I just copied and pasted it incorrectly. |
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keyson
l33t
Joined: 10 Jun 2003
Posts: 830
Location: Sweden
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| Posted: Mon Nov 14, 2016 7:38 pm Post subject: |
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Hi Enrico.
Windows10 use efi boot on a gpt partition.
So you need the part_gpt module to read it. Then You may boot it by running the os prober.
My grub.cfg has this. after probing. Windows on second disk.
| Code: |
### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'Windows Boot Manager (på /dev/sdb2)' --class windows --class os $menuentry_id_option 'osprober-efi-XXXX-XXXX' {
savedefault
insmod part_gpt
insmod fat
set root='hd1,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt2 --hint-efi=hd1,gpt2 --hint-baremetal=ahci1,gpt2 XXXX-XXXX
else
search --no-floppy --fs-uuid --set=root XXXX-XXXX
fi
chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}
### END /etc/grub.d/30_os-prober ###
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(Replaced the efi id by XXXX-XXXX) |
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DONAHUE
Watchman
Joined: 09 Dec 2006
Posts: 7651
Location: Goose Creek SC
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| Posted: Mon Nov 14, 2016 10:56 pm Post subject: |
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@ keyson
IIRC, Enrico has Windows 10 on an MSDOS labeled labeled disk, not on a gpt disk.
He may have to use "bios" or legacy grub to achieve dual boot. Grub2 is appearing to be either or.
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enrico68
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Joined: 21 Oct 2016
Posts: 169
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| Posted: Tue Nov 15, 2016 12:13 pm Post subject: |
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| DONAHUE wrote: | @ keyson
IIRC, Enrico has Windows 10 on an MSDOS labeled labeled disk, not on a gpt disk.
He may have to use "bios" or legacy grub to achieve dual boot. Grub2 is appearing to be either or. |
Exactly, I have an MSDOS labeled disk for Windows 10. I was actually coming to the same conclusion, to use "Legacy Grub", instead of GRUB 2.0, I can try that out and report back. Just one question before I proceed:
as I have said a few posts back, whenever I run
| Code: | | grub-mkconfig -o /boot/grub/grub.cfg |
I get an error message:
| Code: | | /usr/sbin/grub-mkconfig: line 235: /boot/grub/grub.cfg.new: No such file or directory |
and here is the part where line 235 seats:
| Code: | if test "x${grub_cfg}" != "x"; then
rm -f "${grub_cfg}.new"
oldumask=$(umask); umask 077
exec > "${grub_cfg}.new. |
What I did, and that was for sure a mistake, I tried to run a cd called "Boor Repair Disk", to see if that would fix my GRUB issue, but, since running it, it must have created a new "${grub_cfg}.new file, that gives back the error. How can I fix it? I know I should not touch that grub_cfg. file, that is why I want to get someone's help before I mess it up even more...once that is done, I will try and see if I can get around the Grub Legacy thing...that file, I checked, is empty, there is nothing in it... |
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DONAHUE
Watchman
Joined: 09 Dec 2006
Posts: 7651
Location: Goose Creek SC
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| Posted: Tue Nov 15, 2016 2:10 pm Post subject: |
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The "don't touch grub.cfg" can be ignored safely. Inspired by the developer's conceit that their work would be universal and perfect.
It is ephemeral, designed to be rerun every time the kernel name changes, works just as well to rerun it every time we screw it up!
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enrico68
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Joined: 21 Oct 2016
Posts: 169
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| Posted: Tue Nov 15, 2016 3:12 pm Post subject: |
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| I see...but then, again, how can I fix that problem? Is there a way to somehow revert it back to "factory conditions", as it was before my "ingenious" decision to run Boot Repair Disk??? |
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DONAHUE
Watchman
Joined: 09 Dec 2006
Posts: 7651
Location: Goose Creek SC
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| Posted: Tue Nov 15, 2016 4:44 pm Post subject: |
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You can unmerge grub, re-emerge grub, rerun grub-install, rerun grub-mkconfig. Should restore to original condition. I do not know that grub2 for efi is capable of running chainloader to/on an msdos labeled disk. Also I do not know that it won't. You have the good luck to be my first case like this.
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enrico68
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Joined: 21 Oct 2016
Posts: 169
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| Posted: Tue Nov 15, 2016 6:11 pm Post subject: |
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| Quote: | | You have the good luck to be my first case like this. |
AH ah ah...well, let me first sort the grub configuration out first, then we'll address the dual booting. This is getting interesting. I am actually thinking of installing GRUB Legacy, and give it a try, I can always unmerg it and try with GRUB 2.0, again. I'll let you know when I am done, let's see where this will take me. Will keep you posted!
Enrico |
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enrico68
Apprentice
Joined: 21 Oct 2016
Posts: 169
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| Posted: Tue Nov 15, 2016 7:07 pm Post subject: |
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Just a quick question, as I have never unmerged a package before: is this the correct command to uninstall GRUB?
| Code: | | emerge --unmerge grub:2 |
If it is the correct command, do I need to do anything else, before I emerge grub again?
Enrico |
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DONAHUE
Watchman
Joined: 09 Dec 2006
Posts: 7651
Location: Goose Creek SC
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| Posted: Tue Nov 15, 2016 7:57 pm Post subject: |
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that's good. or emerge -C grub
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bandreabis
Advocate
Joined: 18 Feb 2005
Posts: 2490
Location: イタリアのロディで
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| Posted: Wed Jan 04, 2017 12:11 pm Post subject: |
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| keyson wrote: | Hi Enrico.
Windows10 use efi boot on a gpt partition.
So you need the part_gpt module to read it. Then You may boot it by running the os prober.
My grub.cfg has this. after probing. Windows on second disk.
| Code: |
### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'Windows Boot Manager (på /dev/sdb2)' --class windows --class os $menuentry_id_option 'osprober-efi-XXXX-XXXX' {
savedefault
insmod part_gpt
insmod fat
set root='hd1,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt2 --hint-efi=hd1,gpt2 --hint-baremetal=ahci1,gpt2 XXXX-XXXX
else
search --no-floppy --fs-uuid --set=root XXXX-XXXX
fi
chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}
### END /etc/grub.d/30_os-prober ###
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(Replaced the efi id by XXXX-XXXX) |
Hi keyson,
could you tell me how your Windows HD is partitioned?
Is your PC a notebook or a Desktop?
In my case the problem seems to reside in having a HP notebook, so that windows on the second HD wants some data on the first one, screwing it up.
Many thanks.
Andrea
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Roman_Gruber
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Joined: 03 Oct 2006
Posts: 3846
Location: Austro Bavaria
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| Posted: Thu Jan 05, 2017 10:40 am Post subject: |
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| Quote: | | set root='hd1,gpt2' |
as you can see, the partitino activated is root='hd1,gpt2'
I assume the numbering start at 0, so it is a second drive
you just need to activate your windows responsible partition, check grub documentation how the drives are numbered
The more interesting question is how to keep windows from overwriting the UEFI settings / bootloader |
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Installing Gentoo
