I have Windows 10, so I have EFI partition, but during Ubuntu installation I forgot to select EFI partition. Now I always should to turn on UEFI mode if I wanna to use Windows. Can I enable EFI partition for Ubuntu after installation ?
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Can I hint you towards this article https://help.ubuntu.com/community/UEFI
Creating an EFI System Partition If you are manually partitioning your disk in the Ubuntu installer, you need to make sure you have an EFI System Partition (ESP) set up. This partition holds EFI-mode boot loaders and related files. If your disk already contains an ESP (eg if your computer had Windows 8 preinstalled), it can be used for Ubuntu too. Do not format it. It is strongly recommended to have only 1 ESP per disk.
An ESP can be created via a recent version of GParted (the Gparted version included in the 12.04 disk is OK), and must have the following attributes:
Mount point: /boot/efi (remark: no need to set this mount point when using the manual partitioning, the Ubuntu installer will detect it automatically)
Size: minimum 100Mib. 200MiB recommended.
Type: FAT32
Other: needs a "boot" flag.
I have never done this myself but remembered reading about it. Maybe you could also try the magic of boot repair? https://help.ubuntu.com/community/Boot-Repair Sometimes it's also just easier to reinstall Ubuntu...
Daniel Winkler
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