Manually GRUB reconfiguration

marcelo900 · 04-28-2018, 01:16 PM

I installed Windows 10 and Debian on the same computer.

Windows 10 was before encrypted by VeraCrypt, however after Debian instalation, GRUB create entry in boot menu only for Debian and Windows Bootloader

so I should add manually VeraCrypt Bootloader to grub's menu list.

Some informations about my configuration:

Code:

parted -l:
    
    Number  Start   End    Size    File system  Name                          Flags
     1      1049kB  524MB  523MB   ntfs         Basic data partition          hidden, diag
     2      524MB   628MB  104MB   fat32        EFI system partition          boot, esp
     3      628MB   645MB  16.8MB               Microsoft reserved partition  msftres
     4      645MB   103GB  104GB                Basic data partition          msftdata
     5      105GB   256GB  153GB

Code:

efibootmgr -v:
    
    BootCurrent: 0001
    Timeout: 1 seconds
    BootOrder: 0001,DC5B,0000
    Boot0000* Windows Boot Manager	HD(2,GPT,372f84ce-f811-4a58-adad-227679dbd5f2,0xfa000,0x31800)/File(\EFI\MICROSOFT\BOOT\BOOTMGFW.EFI)WINDOWS.........x...B.B.D.O.B.J.E.C.T.=.{.9.d.e.e.8.6.2.c.-.5.c.d.d.-.4.e.7.0.-.a.a.a.1.-.f.3.2.b.3.4.4.d.4.7.9.5.}...a................
    Boot0001* debian	HD(2,GPT,372f84ce-f881-4a58-adf3-223378dbd5f2,0xfa000,0x31800)/File(\EFI\DEBIAN\GRUBX64.EFI)
    BootDC5B* VeraCrypt BootLoader (DcsBoot)	HD(2,GPT,372f84ce-f811-4a58-adf3-227378dbd5f2,0xfa000,0x31800)/File(\EFI\VERACRYPT\DCSBOOT.EFI)

I wanted to add entry for VeraCrypt Bootloader so I add:

Code:

    mounentry "Win10 VeraCrypt Bootloader"{
       insmod ntfs
       set rootnoverify=(hd0,3)
       chainloader (hd0,1)/EFI/VERACRYPT/DCSBOOT.EFI
    }

to /etc/grub.d/40_custom and ran "update-grub"

Unfortunately, when I run "Win10 VeraCrypt Bootloader" in GRUB's menu, I get:

Code:

    error:invalid file name '/EFI/VERACRYPT/DCSBOOT.EFI'.

What is wrong ?

yancek · 04-28-2018, 02:36 PM

Your EFI partition where the veracrypt efi file is, is sda2 and your entries are pointing to sda3. Try adding also insmod part_gpt, might also need insmod chain.

Quote:

menuentry "Win10 VeraCrypt Bootloader"{
insmod ntfs
insmod part_gpt
insmod chain
set root='(hd0,gpt2)'
chainloader (hd0,2)/EFI/VERACRYPT/DCSBOOT.EFI
}

marcelo900 · 04-28-2018, 03:17 PM

Quote:

Originally Posted by yancek

Your EFI partition where the veracrypt efi file is, is sda2 and your entries are pointing to sda3. Try adding also insmod part_gpt, might also need insmod chain.

Code:

menuentry "Win10 VeraCrypt Bootloader"{
insmod ntfs
insmod part_gpt
insmod chain
set root='(hd0,gpt2)'
chainloader (hd0,2)/EFI/VERACRYPT/DCSBOOT.EFI
}

Now, it returns error:

Code:

error: disk 'hd0,2' not found.

in this syntax the numeration is not from zero ?

colorpurple21859 · 04-28-2018, 03:24 PM

Quote:

Now, it returns error:

Code:

error: disk 'hd0,2' not found.

you wouldn't to have tried it with a bootable usb plugged in?

marcelo900 · 04-28-2018, 03:29 PM

Quote:

Originally Posted by colorpurple21859

you wouldn't to have tried it with a bootable usb plugged in?

I do not understand.

indeed, my /boot partition is on outside bootable usb and it is plugged.

marcelo900 · 04-28-2018, 03:40 PM

If I open grub promt (by press C in grub menu) I can run ls command.

It shows:

Code:

(hd0) (hd0,gpt1) (hd1) (hd1,gpt5) (hd1,gpt4) (hd1,gpt3) (hd1,gpt2) (hd1,gpt1) (hd2)

marcelo900 · 04-28-2018, 05:05 PM

it works me (partially):

Code:

menuentry "Win10 VeraCrypt Bootloader"{
insmod ntfs
insmod part_gpt
insmod chain
set root='(hd1,gpt2)'
chainloader (hd1,2)/EFI/VERACRYPT/DCSBOOT.EFI
}

veracrypt asks for a password

Hovewer, after give password, windows try to start (logo and circle) and after a while it crashes (strange horizontal stripes instead of the login screen).

colorpurple21859 · 04-28-2018, 05:29 PM

The bootable usb maybe causing grub to mix up the disk order grub seeing the usb as hd0 and the internal drive as hd1.
I have a laptop that does that when a usb is inserted

yancek · 04-28-2018, 09:41 PM

Your ls output from Grub does not show a second partition on hd0 so hd1,2 should be right.

Quote:

Hovewer, after give password, windows try to start (logo and circle) and after a while it crashes (strange horizontal stripes instead of the login screen).

If you see the windows logo, you are not in Grub any longer but the windows/vercrypt bootloader and Grub won't be able to do anything about that. That means Grub has done it's job and chainloaded your windows or veracrypt boot file, it's a problem with windows or veracrypt.

marcelo900 · 04-29-2018, 04:37 AM

Quote:

Originally Posted by yancek

If you see the windows logo, you are not in Grub any longer but the windows/vercrypt bootloader and Grub won't be able to do anything about that. That means Grub has done it's job and chainloaded your windows or veracrypt boot file, it's a problem with windows or veracrypt.

I don't think so,

because if I start VeraCrypt loader from UEFI menu it works properly

colorpurple21859 · 04-29-2018, 06:35 AM

maybe editing the #GRUB_GFXMODE=640x480 line in /etc/default/grub will help.

yancek · 04-29-2018, 09:39 AM

It might be the resolution setting so you could try some of the suggestions at the link below to edit /etc/default/grub with compatible resolution. I saw some posts which indicated the same problem but after 10-20 seconds, the garbled screen changed. Have you waited that long to see? Only other thing is the suggestion above.

marcelo900 · 04-29-2018, 12:07 PM

Quote:

Originally Posted by yancek

It might be the resolution setting

most likely, login screen is responsive to my mouse movement, it looks like:

https://cdn3.imggmi.com/uploads/2018...d2af5-full.png

Quote:

so you could try some of the suggestions at the link below to edit /etc/default/grub with compatible resolution.

could give me some advice, how I can check which resolution is compatible ?

yancek · 04-29-2018, 03:04 PM

Sorry, I forgot to post the link I referred to earlier. It's below at the Mint forums, read the suggestions in the second post carefully. It explains how to get the resolution from windows/Linux although this is 7 not 8 or 10, don't know if that will matter.

https://forums.linuxmint.com/viewtopic.php?t=173945

Quote:

in this syntax the numeration is not from zero ?

The above quote is from your earlier post, GRUB2 counts physical hard drives from ZERO, partitions from one. In your initial post, you make a reference to a menu.lst file which is a Grub Legacy file and hasn't been used with Debian for years??

Quote:

indeed, my /boot partition is on outside bootable usb and it is plugged.

You should probably explain that in a little more detail. Boot partition for what? Debian, windows, your veracrypt thing?
Your ls output above 3 three drives, hd0 with one partition, hd1 with partitions (including the EFI) and an hd2 drive with no partitions. At the time you ran that command, the EFI partition was hd1,2. If you attach/remove a drive including a flash drive these can change. If you boot from an installed system it can show differently than booting from a flash drive.

Quote:

because if I start VeraCrypt loader from UEFI menu it works properly

I think you may have to be satisfied with that but no harm in trying things. I don't really know anything about veracrypt, other than it's an encryption tool. Since your are only using it with windows, why not add an entry in the windows bootloader?

marcelo900 · 05-08-2018, 04:27 PM

yancek, I solved this problem,

it works properly after instalation intel driver for display (device manager -> display -> update driver).

I've used the microsoft driver before, and that caused the problem