Unfortunately I did not realize that Bitlocker has to be disabled when creating a dual boot of Windows 10 + Ubuntu 18.04.
Therefore I currently find my Windows partition locked with Bitlocker.
Unfortunately I cannot access the Bitlocker recovery keys through my Microsoft account because they have never been uploaded to the cloud; never knew there was such thing as bitlocker on my comoputer.
How can I recover my Windows OS partition? Would I have to uninstall Grub? If so, would my Windows OS boot without problems? And afterwards, would my Ubuntu also still boot?
Best Answer
The only to recovery your data is with the recovery key. You can download it. You can visit that page on any OS.
Source: BitLocker recovery keys
You should be prepared to go back to the Windows Bootloader in the event it's required temporarily.
Since your actions would only be temporary and reversible this shouldn't be a huge concern. However, with any action like this, you should backup your valuable data.