Windows missing from grub

lolboy · 04-30-2018, 08:20 PM

Hello guys, im new around here and well i need a little help
So i reinstalled windows and then deepin just dissapeared from the grub , so i did my work and i got it back in the grub, however now windows is missing and i dont know what to do! I tried update-grub but didnt worked for me, what can i do about this?

frankbell · 04-30-2018, 09:34 PM

Because Windows thinks it is the once and future operating system and there are no others, it overwrote your bootloader.

Could you describe exactly what steps you followed when you ran update-grub? Having more context will better enable us to help you.

Oh, and welcome to LQ.

Teufel · 05-01-2018, 01:28 AM

You have to install os-prober package if you want to add windows to grub menu. Do you have it installed? And mount windows partition before running update-grub.

lolboy · 05-01-2018, 07:08 AM

Quote:

Originally Posted by Teufel

You have to install os-prober package if you want to add windows to grub menu. Do you have it installed? And mount windows partition before running update-grub.

os-prober is already installed and returns me nothing and windows partition it says already mounted

lolboy · 05-01-2018, 07:11 AM

Quote:

Originally Posted by frankbell

Because Windows thinks it is the once and future operating system and there are no others, it overwrote your bootloader.

Could you describe exactly what steps you followed when you ran update-grub? Having more context will better enable us to help you.

Oh, and welcome to LQ.

Thanks

well when i saw that windows was missing from the grub, the only thing i did was trying the update-grub command and the menu entry with the comand /etc/grub.d/40_custom and i tried to update again , but didnt worked

Teufel · 05-01-2018, 12:14 PM

os-prober (did you ran it as root?) should return something like this:

Code:

# os-prober 
/dev/sda1:Gentoo Base System release 2.4.1:Gentoo:linux
/dev/sda3:Windows 7:Windows:chain
/dev/sdb1:Windows 10:Windows1:chain

May be your os-prober is broken?

Anyway you could compose a menu entry for Windows by hand and put it to grub.cfg
Something like this:

Code:

menuentry 'Windows 10 SDB1' {
        insmod part_msdos
        insmod ntfs
        set root='hd1,msdos1'
        parttool ${root} hidden-
        drivemap -s (hd0) ${root}
        chainloader +1
}

lolboy · 05-01-2018, 01:23 PM

Quote:

Originally Posted by Teufel

os-prober (did you ran it as root?) should return something like this:

Code:

# os-prober 
/dev/sda1:Gentoo Base System release 2.4.1:Gentoo:linux
/dev/sda3:Windows 7:Windows:chain
/dev/sdb1:Windows 10:Windows1:chain

May be your os-prober is broken?

Anyway you could compose a menu entry for Windows by hand and put it to grub.cfg
Something like this:

Code:

menuentry 'Windows 10 SDB1' {
        insmod part_msdos
        insmod ntfs
        set root='hd1,msdos1'
        parttool ${root} hidden-
        drivemap -s (hd0) ${root}
        chainloader +1
}

Thank you , worked!Now show the option Deepin and windows, But now when i enter deepin it shows a message like this
mount / dev / sda3 partition to be read only
the windows disks will not be able to read and write normally check "Enable fast startup" in shutdown settings.

restore steps to access windows disk normally
1 reboot to enter windows
2 select restart
3 reboot and enter deepin

what can i do? and thanks for helping me

Teufel · 05-01-2018, 06:16 PM

Could you post here your hard drive partitions layout?
Windows boot entry I posted above - it's works for mine partitions scheme, in your case 'hd1,msdos1' should differs.

colorpurple21859 · 05-01-2018, 07:31 PM

to disable fastboot boot windows, settings, power settings, what does the power button do, Change settings that are currently unavailable, shutdown setting, turn off fastboot

lolboy · 05-01-2018, 07:31 PM

Quote:

Originally Posted by Teufel

Could you post here your hard drive partitions layout?
Windows boot entry I posted above - it's works for mine partitions scheme, in your case 'hd1,msdos1' should differs.

Click image for larger version

Name: Deepin Screenshot_20180501211017.png
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ID: 27546

its on portuguese , but i think you can understand or have a idea

lolboy · 05-01-2018, 08:10 PM

Quote:

Originally Posted by colorpurple21859

to disable fastboot boot windows, settings, power settings, what does the power button do, Change settings that are currently unavailable, shutdown setting, turn off fastboot

I turned fast boot off but still the same thing :/

Teufel · 05-02-2018, 04:32 AM

What is the /dev/sda2 partition? Is it a windows boot partition?
And how does exactly looks your menuentry for Windows? Please post it.