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Hyper-V UEFI bootloader complexities

[…]Forcing GRUB installation to EFI removable media path does basically the same thing as when Ubuntu installer asks you if you want to force UEFI installation: it installs to the removable media path in the ESP (EFI System Partition). This is fine for environment where no other operating system is present. However if there is another operating system present on the device which depends on this fallback location “removable media path” it will make this system temporary unbootable (you can manually configure GRUB later to boot it if necessary though). Windows installer for example *also* installs to the removable media path in the ESP. All OS installers installing things to this removable media path will conflict with any other such installers and that’s why in Debian (and Ubuntu) installers don’t do this by default. You explicitly have to select UEFI mode during the normal installation (what I did).[…]

https://blog.jhnr.ch/2017/02/23/resolving-no-x64-based-uefi-boot-loader-was-found-when-starting-ubuntu-virtual-machine/

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