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I've been trying to install Ubuntu 15.04 alongside Windows 8.1. Windows 8.1 is currently installed, the computer has two drives, both of which (as near as I can tell), use GPT. The first drive is an SSD, and I managed to resize it and add a partition for Ubuntu. The second is a disk drive.

I initially tried to install 14.04, but couldn't get it to boot, even after trying tools like easyBCD and easyuefi and gdisk.

So after spending many hours on that, I found this question. I switched from 14.04 to 15.04, ecstatic that all my woes would soon be forgotten.

Unfortunately, I cannot even install it as it hangs at the "Preparing to install Ubuntu" screen.

I am really at my wits end here. Why would it hang at that screen? What can I check to make this dual boot work?

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I could not get 15.04 to stop hanging, so I switched back to 14.04.

I managed to make 14.04 work when I saw an "Advanced Boot" option under the boot option during the initial UEFI options menu on boot (like the BIOS menu, you just hold down a key like delete or whatever your computer uses to open the menu on boot). In the Advanced Boot options, it turns out I could choose the bootloader installed on the ubuntu partition. That bootloader correctly showed ubuntu alongside the windows loader, so I have the option to boot into either.

I'm still not entire sure I understand UEFI and it's various idiosyncrasies, but for anyone having a similar problem, I suggest looking for an Advanced Boot option or something similar in the UEFI options menu.