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Cake day: June 15th, 2023

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  • You may have destroyed the windows boot loader, which is required for booting windows. Or, more likely, your grub needs to be reinstalled. Reinstall grub first (reinstall package or with the correct grub command) if that doesnt work you may need to use a windows rescue disk to repair the boot loader(could destroy your linux partition, make a backup!) or reinstall windows and then install linux again(can also wipe your data!)

    Try grub first, the other way is the nuclear option. There may be more than one way to repair grub, I recommend you try multiple ways.

    Also: Supergrub can do magic, but is a bit cubersome to use.

    I also dimly remember there being a linux friendly rescue system that can repair windows boot, so you have plenty of options. Good luck!