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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?
Since you got further with 14.04 than with 15.04, and since 14.04 is a long-term support (LTS) version, I recommend you go back to 14.04 and tackle the boot problem. Note that
– Rod Smith – 2015-09-04T22:12:38.773gdisk
will do little or nothing to help you boot. Depending on the nature of the problem, EasyBCD and EasyUEFI may not help, either. Read my page on EFI-mode Linux installs and, if that doesn't help, post a new question providing details of what's not working, including Boot Info Script output.