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Ubuntu 15.04 seems to install better with windows 8.1. So, I was able to install it once and it came up with Ubuntu. Then, I also checked if Windows worked as well. However, it immediately went into windows without the choice for the OS part. I reinstalled Ubuntu, but this time it gave me the error message: 

Executing 'grub-install/dev/sda' failed. This is a fatal error.
Kalle Richter
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Albert Ruehli
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2 Answers2

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If you installed Ubuntu first and than Windows, Windows has overwritten grub bootloader, so it will go directly to Windows. When you are trying install Ubuntu and you get error grub-install/dev/sda it's probably caused because issues like EFI vs. Legacy installation. Try to use Ubuntu Live CD and install on Live CD https://help.ubuntu.com/community/Boot-Repair and try to repair boot loader, that is if you have not corrupt partitions yet.

tikend
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It is amazing. I may not clearly have stated that Windows 8.1 was there first. I followed the boot-repair procedure suggested to me in the answer and it seem to work. I did boot both in Ubunntu and in Windows. Now, I just turned the machine on again and it comes up in Windows again without a choice for the OS.
In the process, the message it gave to me was: http://paste.ubuntu.com/118643335 I was sure that the problem was fixed but it is not the case.

Albert Ruehli
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