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UEFI

Tabla de Contenidos 1. Installing Ubuntu Quickly and Easily via Trial and Error 2. Installing Ubuntu in EFI mode 1. Case when Ubuntu must be installed in EFI mode 2. General principle 3. Identifying if the computer boots the HDD in EFI mode 4. Identifying if thecomputer boots the CD in EFI mode 5. Set up the BIOS in EFI or Legacy mode 6. Creating an EFI partition 3. Identifying if an Ubuntu has been installed in EFI mode 4. Converting Ubuntu into EFI or Legacy mode 7. Converting Ubuntu into EFI mode 8. Converting Ubuntu into Legacy mode 5. SecureBoot 6. See also |
UEFI (~EFI) is a firmware interface that is widespread onrecent computers, especially those more recent than 2010. It is intended to replace the traditional BIOS firmware interface that is prevalent on earlier machines. This page provides information about installing and booting Ubuntu using EFI, as well as about switching between EFI mode and legacy BIOS mode using Ubuntu.
Installing Ubuntu Quickly and Easily via Trial and Error
If you have a computerthat is more recent than 2010 and you do not know whether or not you need to install Ubuntu in EFI mode, you should be able to get Ubuntu installed quickly and correctly using the following steps:
* Create a LiveDVD or LiveUSB of Ubuntu-Secure-Remix 64bit or of Ubuntu (>=12.04.2) 64bit. The former is more convenient, as it already includes Boot-Repair, which is used in step 4.
* In yourBIOS, disable QuickBoot/FastBoot and Intel Smart Response Technology (SRT).
* Boot your PC using the LiveDVD or LiveUSB and choose "Try Ubuntu". If you get a Secure boot or signature error, disable SecureBoot as described here, then retry to boot the disk.
* Install Ubuntu from the Live CD/DVD or Live USB in the usual manner, then reboot the PC.
* If the PC does not load Ubuntu(but instead loads Windows, for example, as in Bug #1050940), or if the Windows entry in the GRUB 2 menu does not boot Windows (see Bug #1024383), boot your PC using the Live CD/DVD or Live USB and choose "Try Ubuntu" once again. When the live session has loaded, run Boot-Repair (see link for details). When Boot-Repair loads, click on the "Recommended repair" button. Then reboot the pc.
* Thisshould fix most boot problems. If this does not fix your boot problems, please run Boot-Repair's "Recommended repair" a 2nd time, and write on a paper the URL (paste.ubuntu.com/XXXXXX/) that will appear. Then reboot the pc.
* If still not good, please create a new thread in this forum, describing your problem and indicating the URL you wrote in the previous step.
Installing Ubuntu in EFImode
Warning: if you are a new Ubuntu user, you may want to follow the advice of the previous paragraph.
Case when Ubuntu must be installed in EFI mode
Having a PC with EFI firmware does not mean that you need to install Ubuntu in EFI mode. What is important is below:
* if the other systems (Windows Vista/7/8, GNU/Linux...) of your computer are installed in EFI mode, then you must installUbuntu in EFI mode too.
* if the other systems (Windows, GNU/Linux...) of your computer are installed in Legacy (not-EFI) mode, then you must install Ubuntu in Legacy mode too. Eg if your computer is old (<2010), is 32bits, or was sold with a pre-installed Windows XP.
* if Ubuntu is the only operating system on your computer, then it does not matter, you can install Ubuntu in EFI modeor not.
General principle
To install Ubuntu in EFI mode:
* Use a 64bit disk of Ubuntu (32bit installer does not detect EFI)
* Use the last version of Ubuntu. Support for UEFI appeared in 11.10, but has become more reliable in next versions. Support for UEFI SecureBoot appeared in 12.10 and 12.04.2.
* Set up your firmware (BIOS) to boot the disk in UEFI mode (see the "Identifying...