Read on here.
https://www.ctrl.blog/entry/dual-boot-bitlocker-device.html
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and Accept as answer
if the reply is helpful--
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So I have on my laptop (asus zephyrus g14) Manjaro (linux) and Windows 11 pro at the same time. Both are not encrypted. But I want to encrypt my Windows 11 pro using BitLocker. The TPM is available. When I start the BitLocker and click on "Turn on BitLocker", I get an error message saying "The volume for a file has been externally altered so that the opened file is no longer valid". I tried to clear the TPM but still have this error. I don't know what to do, I tried to google this issue but I found nothing! Please I need some help!
Read on here.
https://www.ctrl.blog/entry/dual-boot-bitlocker-device.html
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
Maybe this one helps.
https://answers.microsoft.com/en-us/windows/forum/all/windows-11-encryption-while-dual-booting/5218e887-5848-4b10-b7d7-d51f15f7a92c
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
Sounds good, since you have a specific requirement I'd suggest starting a case here with product support.
https://support.microsoft.com/hub/4343728/support-for-business
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and Accept as answer
if the reply is helpful--
This might be due to Windows boot manager being edited when installing linux. Couple of questions:
What version of Linux you running?
Did you install Linux through windows? E.g. like Ubuntu or via booting to the live USB/CD and installing from there.