Answer by mcendu for Dual-boot Windows/Ubuntu on iMac: Windows not booting...
On Mac, right after powering on (before GRUB or the Apple logo appears), press and hold Option (⌥). You will be greeted with macOS's own boot menu, and you can try to boot Windows from there.
View ArticleDual-boot Windows/Ubuntu on iMac: Windows not booting from GRUB or EFI
On my iMac 16.2 with already installed Windows 11, I also installed Ubuntu 22.04 (in the meantime upgraded to 23.10). The installation process went flawless until the first start with both OSes...
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