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[Software] Windows Drive Encryption when dual booting Debian 12 and Windows 10

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Thinkpad E14
Dual booting Debian 12 and Windows 10 on nvme drive #1 and another Windows 10 on nvme drive #2.

After a few days and hours of googling I've got it working... I think.

My question:
Secure boot is enabled and the shimx64.efi bootloader set up to give a Grub menu of Debian as well as both Windows 10 OSs.
I was seeing a yellow exclamation mark alongside the C: drive when booting in to Windows 10 via the Grub Menu bootloader. Actually I was seeing this with secure boot enabled AND disabled.
I was NOT seeing that when I booted in to Windows 10 directly by selecting a Windows bootloader from the BIOS?

Debian talks about shimx64.efi being signed my Microsoft but I don't know if that is related or not?

In the Win 10 BitLocker Drive Encryption GUI it was saying that Bitlocker was OFF on all the system drives on each of my Windows 10 OSs.

According to this thread the yellow triangle means: "Device Encryption is suspended.... while your files are encrypted the encryption key is accessible. However, Device Encryption should be disabled, since Ubuntu does not play well with it."

So I followed the suggestion also in that thread and disabled Bitlocker protection for the C: drive. Something I am confused about? When I went in to the BitLocker GUI in win 10 it said it was NOT enabled but when I ran these commands:

Code:

manage-bde -status C:manage-bde -off C:
I could see that files on the drive were encrypted.
After I ran the command to turn off encryption the Yellow triangle went away even I booted in to Windows 10 via Grub shimx64.efi bootloader.

My Question:
What was I seeing here and did I do the right thing?
Maybe I'm misunderstanding how BitLocker works and maybe this was nothing to do with BitLocker?

With Secure boot on OR off... Why was there no yellow triangle when I booted in to Win 10 using a Windows bootloader but there was a yellow triangle when I booted in with the Debian grub shimx64.efi bootloader?
Maybe I have got some setting wrong in the Grub configuration?

Any help much appreciated.

Cheers,

Flex

Statistics: Posted by flexmcmurphy — 2024-10-27 20:00 — Replies 0 — Views 21



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