If not go back into the 'Boot' item in the BIOS menu and make sure the laptop's DVD is at the top of the boot devices. Close the DVD tray and restart your laptop.
Using the cursor keys highlight the menu item 'Main.'.
This will take you into the UEFI/BIOS screen.
Some of the steps are from memory, so if something doesn't work please let me know. I believe I have an answer that allows you to install Ubuntu 14.04.2 alongside Windows 8.1 on an Acer Aspire ES1-512. After several unsuccessful attempts to install Ubuntu alongside Windows. As it happens this course requires the students to use Ubuntu. Recently, I bought an Acer Aspire ES1-512 for a college course.
