Keeping access to Ubuntu after upgrading to Windows 8.1

Using Windows 7 Pro. I got a Windows 8.1 License with a setup .iso file. I want to setup (upgrade) Win 8.1, but before, I need to verify something. I have Ubuntu installed side by side with Win 7 (Win 7 installed first). The current boot (grub) is of Ubuntu
because it's the last one installed. My question is : "Will installing Win 8.1 overwrite the boot (grub) of Ubuntu? if it's the case, Will Windows give me (as an alternative) the choice of starting Win 8.1 or Ubuntu?"
Because in fact, my current PC came with SLED installed, and I need Windows of course, so when I installed Win 7, I lost access to SLED (grub has been wiped) and Windows started directly. That's why I installed Ubuntu after Windows 7 because I need at least
one Unix OS installed side by side with Windows.
Looking on the web is saying yes, the grub will be lost. I need to confirm from you here, because, any error will cost me a very big pain (reinstalling the tens of apps that I have after installing Win 8.1 is enough), and Thanks in advance.

Hi,
Based on my test,if you upgrade from Windows 7 to 8.1 , this update will overwrite the MBR.
And you will lost my grub.I think you can repair the windows boot first then deal with Ubuntu using the live CD and boot-repair application.
But I cannot confirm if this is a right method to resolve the issue.
So,I suggest you post this question to ubuntu forum for further help.
http://ubuntuforums.org/
Note: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.
Regards
Kelvin hsu
TechNet Community Support

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