I have recently purchased an Asus X551M laptop and have tried installing Mint in a dual boot configuration multiple times. I have successfully installed it twice, but bot times was unable to actually boot into the OS, or even put it first in the boot priority, as it didn't even show up in the list.
I've decided to try installing Ubuntu 14.04 LTS instead, as I've read it deals with UEFI better. My main barrier though, is that there is absolutely no option to switch to Legacy BIOS on my computer. I can disable boot security and fast boot, and I can turn on CSM. I need Windows for my schoolwork and gaming, so simply overwriting it isn't an option. I'm at my wits end and am about to give up on Linux. Does anyone have any experience with this problem, or any suggestions?
*For both distros I used/am using the 64 bit image. I am using the Universal Usb Installer.
*I've just tried to install 14.04 again. I disabled Secure Boot and put my USB (which was labeled as being UEFI) as the first boot priority. The Ubuntu installer runs fine, but does not detect Windows 8.1. Also, I have 3 partitions as it is, is it true you shouldn't have more than 4?
It is worth noting that if the USB is launched in CSM then Linux detects Windows, installs properly, but does not boot; nor does it become an option in the Boot Priority. If the USB is launched in UEFI mode, then Ubuntu does not detect Windows. Quite the conundrum.