Description of problem: os-prober doesn't see Windows installed at the same hard drive in UEFI mode. Version-Release number of selected component (if applicable): os-prober-1.77-8.fc35.x86_64 How reproducible: Always (tested just on one desktop, in UEFI, with a pretty old Win10 build) Steps to Reproduce: 1. Install windows 10 in UEFI 2. Install Fedora 35 in UEFI next to the Windows 10 on the same drive 3. Actual results: grub is not displayed on boot, booting each os directly through the UEFI boot menu works well. Expected results: grub should get displayed (because there is another OS available to boot into), os-prober should see Windows 10 installation. Additional info:
I can test this on some other desktop and in BIOS mode too with newer Win 10 build tomorrow.
Proposed as a Blocker for 35-final by Fedora user frantisekz using the blocker tracking app because: The installer must be able to install into free space alongside an existing clean Windows installation and install a bootloader which can boot into both Windows and Fedora. On the first attempt, grub didn't show Windows 10 boot option. On the second attempt, it wasn't possible to a cleanly installed Windows 10 after Fedora installation at all (not even through the UEFI boot menu). I'll do some more clean test attempts.
So, this works just fine, must've misconfigured something. There are some issues in more complicated setups that I'll verify, after the release probably. Sorry for the noise.
No problem. About the issue, my guess is that the Windows partition was not mountable in the first attempts because it was not properly unmounted (this happens when Windows 'fast poweroff' feature is enabled, or if windows is hibernated).