Modern PCs, particularly those with Windows 8 preinstalled, have replaced the traditional BIOS with a new system called UEFI. Both perform the same job, detecting and initializing your hardware before handing it over to your OS, but UEFI represents a quantum leap forward from the somewhat primitive capabilities of the traditional BIOS. The UEFI offers a much wider range of features than that found in the BIOS, all wrapped up in a much more user-friendly, graphically pleasing interface. There are, however, potential issues to circumvent.
First, because UEFI is a newer standard, it’s not compatible with legacy hardware. This problem is circumvented by a special Compatibility Support Module (CSM), which enables you to emulate the BIOS to run older hardware and OSes. More controversially, UEFIs also ship with a Secure Boot mode, which, while making PCs less susceptible to malware, can lock the PC to only using Windows 8. Again, this feature can—in most cases—be disabled, but the good news is that Ubuntu 14.04 LTS fully supports newer hardware and Secure Boot, so you won’t need to disable either to install it alongside Windows. One UEFI feature you’ll definitely need to disable, however, is FastBoot (also called QuickBoot or FastStartup).
Tweak the UEFI Accessing the UEFI is the same as entering the BIOS setup utility. Simply switch on your PC, then tap the key prompted to enter setup when it appears on-screen, typically F2 or Del. First, verify that FastBoot has been disabled by looking for a section called "Windows 8 Configuration," or—if that's not present—"Boot." Once you've found it, make sure it’s switched off or disabled. You may need to tweak the CSM and Secure Boot settings if you intend backing up your system using SystemRescueCD. Again, look in the Windows 8 Configuration if it exists for Secure Boot, which may be listed as "Windows 8 Logo Requirement."Either way, disable it should you have problems booting SystemRescueCD. If the section isn’t present, look under "Security" instead. The CSM module may be part of the Windows 8 Logo Requirement screen, or it’ll be hidden away on its own Many modern PCs now give you the option of booting in UEFI or legacy BIOS mode, with the latter allowing you to install older operating systems. Ubuntu works fine with both UEFI and Legacy modes, but other environments—such as SystemRescueCD —require booting from a legacy option.
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Some PCs even support mixed-mode booting, presenting both legacy and UEFI choices direct from the boot menu, so you don’t need to wade into the UEFI shell to switch between them. If you’ve wondered why some boot options have been displayed twice, this is why: look closely and you’ll see one option is prefixed by UEFI. This gives you the option of choosing which mode to boot that drive in. It’s a good way of testing whether a certain OS or bootable disc works with UEFI or not. If you’re only offered a single set of boot options, your UEFI shell will only allow you to boot in either UEFI mode or legacy. The latter requires CSM to be enabled, but once done you should be able to change boot settings—including device priority—from within the Boot section of the UEFI shell. If your PC supports mixed-mode booting, you may need to set a different default boot device, in which case take care to select the right mode when choosing which device (typically optical or boot hard drive) to make the default.
Get your system configured correctly, even Windows 8 systems Make sure your FastBoot settings are disabled before attempting to install Ubuntu. (we found it buried away at the bottom of the Boot menu on our ASRock motherboard, for instance).
Click this to reveal a selection of different options covering different hardware. Look for references to PXE (pre-boot environment), GOP (graphics), and Storage (or SATA), as well as USB and PS2, if applicable. This enables you to selectively switch CSM on and off for specific devices as required. Some motherboards—including our ASRock—enable you to run both modes as required. (In the case of ASRock, we set each one to "Do not launch" to make this setting the norm). If there are no apparent options for editing the Secure Boot or CSM settings, contact your PC manufacturer to verify whether or not these can be disabled. In most cases,
PCs built using offthe-shelf motherboards should have the required options available, but some manufacturers have been known to provide hobbled boards. As we mentioned earlier, upgrading a PC’s graphics card often requires enabling CSM support. So, even if the controls aren’t already supported, the manufacturer may have relented under pressure from end users and provided a UEFI update on its website to enable the required option