V字龍 (Vdragon) says to Ubuntu 台灣社群> if I just delete Windows, reserved(of windows) partition and expand the EFI then everything will be fine like already installed ubuntu? It should be fine. > And How can I backup EFI partition and files of it using ubuntu? The EFI system partition is merely a FAT file system with 0xEF partition code, simply mount it and copy all files in the file system should do.at Mon, Dec 16, 2019 8:22 PM