I have an EFI computer dual-booted with Windows and Fedora/Cinnamon. I decided to install Gnome3 on my Fedora partition, and all seemed to be going well until I rebooted my computer. Previously, a few Fedora kernels as well as Windows Boot Manager had appeared in the Grub2 menu, but now, only the Windows Boot Manager shows up.
I am not worried about my files as I have mounted my linux partition (on /dev/sda8) and copied everything in /home. I logged into a live F28 usb to do this.
In my live usb, I tried using
chroot to get into my Fedora partition and run
grub2-mkconfig -o /boot/grub2/grub.cfg. This generated this file. It appears that my multiple Fedora kernels are in the Grub menu, but when I reboot, only "Windows Boot Manager" appears.
I have also tried reinstalling grub through DNF, to no avail.