I have a new Acer Aspire V3-572 with a pre-installed Windows 8.1. I tried to install Ubuntu 14.04 LTS alongside Windows in UEFI boot mode, however, the systems gives me the following message "System doesn't have a usb boot option" whenever I try to boot from the usb. I modified the Boot priority options to detect the USBs first, but nothing has changed. Hence, I had to switch to legacy mode to install Ubunutu, and it worked perfectly. The problem now is that Windows does not appear in the grub menu. I tried to use boot-repair and it advised me to switch to UEFI boot mode before proceeding with the "recommended repair". I did as advised, but now, every time I boot, it directly boots into windows. Hence, every time I need to use one of the OSs, I need to switch back and forth between Legacy and UEFI mode. I want to switch the installed Ubuntu to UEFI, but I can't due to the error message mentioned earlier. Any help with this problem would be appreciated. I have searched all the internet, and I couldn't get a perfect solution for the problem.
Thank you in advance.