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I use Windows 7 on a multiple-boot machine (beside Win7, I have different Linuxes, using Grub).

I want to freely upgrade Windows 7 to Windows 10.

Will the procedure have some impact on the multi-boot structure that I should know about?

As JourneymanGeek reminded me in the comment, the grub will be removed. It happened often, even when installing a new Linux system. I can reinstall Grub.

What about other things? I remember something about a Win10 feature not really shutting down the usual way, but just 'hibernating' instead or something, and that giving some problems in Linux (hard drives not mounting as far as I remember)...

UPDATE:

Following this solution to make a full shutdown in Windows 10 without disabling hybrid boot involving the command shutdown /s /t 0, the instalation partition of Windows 10 is not available in Linux:

enter image description here

The error message says that Windows is still in hibernation mode. So, that is not a full shut down.

The same happens after disabling hybrid boot completely, as indicated here.

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  • There's a pretty good chance it'll overwrite your current bootloader. As such, I am fairly doubtful that there will be no impact. As with any major update, backups and pre-planning is a good idea!
    – Journeyman Geek ♦
    Jul 28, 2015 at 11:14
  • @JourneymanGeek - please take a look at my updated question
    – user162573
    Jul 28, 2015 at 11:20
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    You need to shutdown Windows 10 the same way you shutdown Windows 8.1/8.0 you can create a shortcut in order to do this. You can also just disable the hybrid shutdown if you want.
    – Ramhound
    Jul 28, 2015 at 12:37
  • @Ramhound - I use Windows 7. Could you link to more details?
    – user162573
    Jul 28, 2015 at 13:59
  • @cipricus - If after you do some research on the subject, you still cannot figure it out on your own, I will be happy to do that.
    – Ramhound
    Jul 28, 2015 at 14:15

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The only two problems I encountered where those mentioned in the comments above:

1. Grub is removed, and no other OS except Windows 10 is thus accessible.

2. Windows 10 uses the Hybrid Boot feature, which basically hibernates instead of shutting down the system, and this may cause problems with multi-boot in Linux (windows partitions not accessible).

So:

1. In order to restore Grub, boot in a live USB and install Boot-Repair. In Ubuntu:

sudo add-apt-repository ppa:yannubuntu/boot-repair&&sudo apt-get update&&sudo apt-get install boot-repair

Because I use a customized grub list (customized with Grub Customizer in one of my Linux systems) and because I wanted that list restored, I preferred the advanced options to re-install grub on that specific Linux system

(unimportant notice: the example image is not in a live session, where the "OS now in use" specification will be absent)

enter image description here

while un-checking the option to purge grub

enter image description here

Not purging grub is also a shorter and simpler process.

2. To access Windows partition from Linux Win10 hibernation/hybrid boot has to be avoided.

I first tried this solution to create a shortcut in Windows that would run the command 

shutdown /s /t 0

to do a full shut down (without disabling hybrid boot for the normal shutdown command).

But that didn't work, as indicated in the updated question, nor did fully disabling hybrid boot as indicated here.

What worked was this solution to completely disable hibernation - source here:

Winkey-X : Command Prompt (Admin).

Run:

powercfg /h off

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