I have windows 8.1, and I want to give ubuntu a go. I started looking at a few dual boot guides and tried disabling fast boot and switching to legacy BIOS. When looking for fastboot setting, i went into power options showed unavailable options and there were no signs of it anywhere. When i changed from UEFI to legacy, it brought up an error to tell me it couldnt find even windows. Does ANYBODY know 1) where the fast boot settings could be? or how to disable it? and 2) how to boot into windows even when in legacy BIOS?
There are two types of "fast boot" options:
If Windows was installed in EFI/UEFI mode, it's impossible to boot it in BIOS/CSM/legacy mode -- at least, not without converting the partition table from GPT to MBR and installing a BIOS-mode boot loader. I don't know of any site that documents the precise procedure for doing this conversion. Personally, I wouldn't try without some very compelling reason. It's almost always better to install Linux in EFI/UEFI mode. See my Web page on this topic or the Ubuntu community wiki on the subject for more on how to install in EFI mode.