Okay thank you I will try those links. But how about the other issue of trying to get back the bootloader i.e. get back the GNU Grub menu (keep in mind I have no access to Windows right now)? I set UEFI settings to default and that made the GNU Grub Menu not appear on startup and so no way to...
Yes, at the time when I just faced the BitLocker thing, I was able to see the Grub menu as before where I could select between Windows and Linux (Ubuntu). So soon in desperation to fix that BitLocker thing, I reset my UEFI settings to default so after that I found out there is no Grub menu now...
I had previously set up dual boot linux-windows OS two years and also had bitlocker on to encrypt windows C drive which I should not have needed to I think. All was fine that time since I had keys saved to ms account (I had set bitlocker key to save to ms) that worked! But yesterday I logged...