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I'm trying to do a dual-boot installation of Ubuntu and I've noticed that there is already an EFI partition in my SSD. Do I need to create a new one for my Ubuntu Partition?

Disk partitions

  • Very likely yes, but are you currently using the partition named Ubuntu (D:) ? – Itakura Jan 26 at 1:13
  • I’m not but I’ve been trying to install it with that partition being unallocated and I just won’t install, so I thought maybe if I formatted as FAT it might just do the job – Marco Castro Jan 26 at 1:15
  • What properties have you set your boot drive to? (Partition Scheme, File System, Target System etc) – Itakura Jan 26 at 1:25
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    You can only have one ESP per drive. You can have a second FAT32 partition with .efi boot files. Some vendors do that for their vendor files. And a few do that for dual installs of Windows, so grub can separately boot them. But only one ESP per drive which will be the partition UEFI uses to boot from. You are showing exFAT with Ubuntu description?? Linux needs Linux formats usually ext4. – oldfred Jan 26 at 3:46
  • @oldfred That is correct, I don’t know why I though exFat was a good idea. But then I’m curios if I’m trying to Ubuntu as dual-boot is gonna boot up from that windows EFI partition? Or I have to deallocate that partition and install the one that comes with Grub or the Ubuntu installer – Marco Castro Jan 26 at 3:50
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No.

In fact, I created one (green arrow), and the installer ignored it, and used the existing Windows one (red arrow).

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Ubuntu UEFI Community has instructions for creating EFI partitions and in the documentation they mention the following:

(Also there is good information about the EFI partition).

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.

  1. 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.

  2. 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.

UEFI - Ubuntu documentation

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