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I think that my situation is a bit tricky but I am not used to this kind of operations so I could make some mistakes and I apologise.

A week ago I had a dual boot, with GRUB that was installed on the SSD (so it started faster). When booting, I used to chose between Ubuntu 17.04 (Installed on a partition of an HDD, that has MBR) and Windows 10 (Installed on the SSD, NOT MBR).

Now I have reinstalled Windows and GRUB is not there anymore, since I wiped the drive. I would like to restore that dual boot, I tried from a live version of Ubuntu with disk-repair tool but I did not managed to. I don't know what to do and I hope someone has got some clues.

Thanks in advance for reading this.

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    Are both systems UEFI or both BIOS boot? What brand/model system? May be best to see details, use ppa version with your live installer or any working install, not older Boot-Repair ISO: Post the link to the Create BootInfo summary report. Is part of Boot-Repair: https://help.ubuntu.com/community/Boot-Info – oldfred Jul 05 '18 at 19:34

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When you installed Windows, it replaced GRUB with the Windows bootloader.

Try this from Ubuntu LiveCD, or this from Windows.

Another option is to boot from Ubuntu LiveCD, mount the old Linux partition, save your files and then wipe it and reinstall Ubuntu alongside with Windows.