I wanted to install ubuntu 12.04 alongside my windows 8.1 (model Asus X55c) . I followed instructions of the forums and disabled fast boot. But I didn't find any option to disable UEFI mode in boot menu.(Actually,I don't understand all settings of boot menu)I also tried to install ubuntu by 'Try ubuntu' through bootable usb .But it didn't see any option like 'intall ubuntu alongside windows 8.1 ', rather I found that it could not detect any operating system installed in my laptop(But windows 8.1 was there !).

Please help me.