Each new version of Ubuntu is working better with UEFI. Also the vendors are fixing the bugs they had in UEFI as they only tested with Windows.
If your model is an Ultrabook, you have UEFI as a new way to install, dual video which may require some effort and Intel SRT or RAID that adds issues.
If you are primarily a Windows user you proably want to keep the Intel SRT as it provides some speed up to Windows. Some with larger SSD just install Ubuntu to SSD and have a faster Ubuntu but then Windows is just running from hard drive like Windows 7 did.
You must turn off the permanent hibernation or fast boot and remove the RAID meta-data. Turning Intel SRT back on will create the RAID on the SSD if that is what you want.
Always backup efi partition and your Windows install first. Make a Windows repair flash drive.
Fast Startup off/hibernation
Force removal of hiberfil from Ubuntu
sudo dmraid -E -r /dev/sda
sudo dmraid -E -r /dev/sdb
Also shows Windows 8 screens
Installing on a Pre-Installed Windows 8 System (UEFI Supported)
Shows install with screen shots.
Boot Repair -Also handles LVM, GPT, separate /boot and UEFI dual boot. required for UEFI & grub bug fixes