I recently purchased an Acer Aspire V15 notebook (model V3-572G-76EM) which came with Windows 8.1 preinstalled. My goal is to be able to dual-boot Windows and Ubuntu. However, I am stymied at this point.
I have managed to create a partition on the disk and install Ubuntu 14.04 LTS to it. However, the only way I could find to get the computer to recognize the Ubuntu live CD at startup was to disable UEFI. I can boot into Ubuntu if I go into the BIOS and disable UEFI. However, when I boot in this way, the GRUB does not display, so I don't have the option of booting into Windows. I can boot into Windows if I go into the BIOS and re-enable UEFI. However, if I do this with boot media selection enabled in the BIOS, and press F12 at system startup, the only available option is Windows Boot Loader. I don't find this to be a satisfactory solution for the long term.
I have read Dual boot Win 8 / Ubuntu loads only Win, Installing Ubuntu Alongside a Pre-Installed Windows with UEFI as well as a few other articles from askubuntu.com and the Ubuntu documentation site.
I have downloaded and run the Ubuntu Boot-Repair utility. It recognized the UEFI partition even when Ubuntu is running (necessarily) in Legacy mode, but cannot convert my existing (BIOS-based) Ubuntu installation to a UEFI installation unless Ubuntu is already running in UEFI mode, which doesn't help. What must I do to correct this and have a truly dual-boot system?