How can I convert Ubuntu to UEFI

Question

I want to install Ubuntu 14.04.4 in UEFI mode alongside windows 8, which is already in UEFI mode.

My partition scheme is GPT.
Ubuntu is on /dev/sda5.
Legacy bootloader on /dev/sda.
Windows on /dev/sda4.

UEFI bootloader in EFI partition

How would I go about doing this?

You can un-install grub-pc(BIOS) and install grub-efi-amd64(UEFI). Easiest to do with advanced options in Boot-Repair. https://help.ubuntu.com/community/Boot-Repair — oldfred, Jul 22 '16 at 13:11
You can Add an EFI system partition to an existing installation with MBR, see my answer here: http://askubuntu.com/a/559008/40581 for UEFI Secure Boot you need to install shim and linux-signed-image-generic — LiveWireBT, Jul 22 '16 at 16:21
Possible duplicate of How can I change/convert a Ubuntu MBR drive to a GPT, and make Ubuntu boot from EFI? – skip the part about converting the partition table. There's also Which commands to convert a Ubuntu BIOS install to EFI/UEFI without boot-repair on single boot hardware? and “Converting Ubuntu into UEFI mode” in the community help. — David Foerster, Jul 23 '16 at 11:43

score 0 · Answer 1 · answered Jul 22 '16 at 13:05

0

You can't 'convert' Ubuntu to UEFI. It is already installed in UEFI mode, because the uefi bootloader uses an EFI partition (as well as Windows, too). In (old) BIOS mode there is no need for an EFI partition. Legacy bootloader seems to be kinda backup boot mode, in case efi bootloader got corrupted.

answered Jul 22 '16 at 13:05

ipse lute

2,584

You can have Ubuntu in CSM/Legacy/BIOS boot mode on gpt partitioned drives. – oldfred Jul 22 '16 at 13:10
I want to have UEFI grub2 instead of legancy grub2 is my question clearer – ap4ss3rby Jul 22 '16 at 13:14
@ap4ss3rby: the name "legacy grub2" is a bit odd, because "legacy grub" usually refers to Grub 1.x (with x < 90, i. e. not Grub 2 or its pre-releases). A better term would be something like “Grub in legacy mode” as opposed to “UEFI mode”. – David Foerster Jul 23 '16 at 11:40

How can I convert Ubuntu to UEFI

1 Answers1