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I want to reinstall my Windows 10. If I am correct I need to delete the ntfs Files System, that is the partition sda2 and sda3, right ? I should not delete sda1 because it is the partition used for booting the system, right ?

After reinstalling Windows will Grub be working fine or do I need to fix it and how ?

Gparted Image

  • Don't delete any partitions. Just reinstall Windows, and then use the boot-repair tool from the Ubuntu website. – TheWanderer Jan 17 '16 at 15:35
  • Well actually I want to delete the partitions. – Devid Jan 17 '16 at 15:38
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    Delete sda2 then. sda3 is a Lenovo recovery partition, which might come in handy. – TheWanderer Jan 17 '16 at 15:39
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    @Devid : Just format the sda2 partition with ntfs and select this partion when reinstalling Windows ! :) – cl-netbox Jan 17 '16 at 15:43
  • Is the Lenovo partition sda3 so important, because I would also like to delete that ? After I install Windows again should I just use boot repair on a live CD ? – Devid Jan 17 '16 at 15:45
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First format the sda2 partition with ntfs.
Reinstall Windows - select this partition.
Afterwards reinstall GRUB boot loader.

Boot from Ubuntu installation media.
Select Try Ubuntu without installing.

On Live desktop - open a terminal.
Execute the following commands :

sudo mount /dev/sda6 /mnt  
sudo grub-install --boot-directory=/mnt/boot /dev/sda

Note : sda = disk | sda6 = system partition

When you want to keep Windows, it is recommended to keep the sda3 Lenovo partition as well.
It might contain important tools for recovering vendor specific - Windows related functionality.
In case there is no Windows entry in GRUB menu, boot Ubuntu ... open a terminal and execute :

sudo update-grub
  • @Devid : Did you get Windows and after that GRUB installed successfully ? :) – cl-netbox Jan 19 '16 at 9:29
  • Not yet, but soon. I am confident though that your answer is the best, that is why I accept it. Thanks – Devid Jan 19 '16 at 13:40

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