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I have these partitions: sda 10/11/12 are data storage partitions and sda 7/8 are Linux partitions. I don't know what all other partitions do and whether it is safe to remove them. Whenever I restart my laptop it shows the Windows boot loader too even after applying the command sudo update-grub.

Please help me to remove Windows completely.

cl-netbox
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Karan Nagpal
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  • why don't you format all other partitions except sda 7,8,10,11,12. That must solve the problem. – kashish Dec 21 '16 at 07:54
  • I don't know what sda 1,2 are for – Karan Nagpal Dec 21 '16 at 08:06
  • It's explained [here](https://en.wikipedia.org/wiki/EFI_system_partition). – kashish Dec 21 '16 at 08:19
  • my ubuntu will boot even after I delete sda 1,2,3? The link says it contains bootloaders for all installed OS's. – Karan Nagpal Dec 21 '16 at 08:24
  • Deleting `/boot/efi` will (most probably) cause boot problems for ubuntu but you can reinstall grub2 from live cd/usb to fix that as explained [here](http://www.howtogeek.com/114884/how-to-repair-grub2-when-ubuntu-wont-boot/). – kashish Dec 21 '16 at 08:43
  • Unless you understand what's on them, deleting or reformatting partitions is asking for trouble. In this case, GRUB is detecting the Windows boot loader on the [EFI System Partition (ESP)](http://en.wikipedia.org/wiki/EFI_System_partition) -- `/dev/sda1` in this case. (Caveat: Some OEMs put the Windows boot loader elsewhere, and it might be on `/dev/sda2` on this system.) Deleting one file (`bootmgfw.efi`) on the ESP should remove it from GRUB's menu, after `update-grub` is run. cl-netbox's answer does a more thorough cleaning of unnecessary files with minimal risk of creating new problems. – Rod Smith Dec 21 '16 at 17:29

1 Answers1

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If you really want to remove every trace of Windows ... follow these instructions :
Boot from an Ubuntu installation media and select Try Ubuntu without installing.
On the Ubuntu Live desktop open a terminal and execute the following command : 

sudo mount /dev/sda1 /mnt  
sudo dbus-launch nautilus

Navigate to the mnt/EFI folder and delete everything except the Ubuntu folder.
Then open the Trash folder and empty Trash. Close Nautilus and open GParted.
Delete the partition /dev/sda2 and the partition /dev/sda3 (see screenshot).

Boot the Ubuntu system ... open a terminal and execute : sudo update-grub
Now there shall be no Windows entry in the GRUB boot loader menu anymore.
Important : Do NOT delete /dev/sda1, it would cause an unbootable system.

Note : Although removing entries from the mnt/EFI folder can of course be done from within the terminal, I intentionally chose this method to make it most easy for you to achieve what you want.

cl-netbox
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