💻 Dual Boot Kali Linux & Windows Without Breaking GRUB (2025 Guide)

Installing Kali Linux alongside Windows often ends in disaster: broken bootloaders, missing GRUB, or even lost data. But not anymore. Here's the cleanest, safest way to dual boot Kali and Windows 10/11 on UEFI systems in 2025.

🧰 What You Need

• Windows 10 or 11 pre-installed (UEFI)
• Latest Kali Linux ISO from kali.org
• Rufus (to make a bootable USB)
• Minimum 30GB free space on your SSD/HDD

⚠️ Backup First!

This method is safe, but always back up important data before modifying partitions.

🔧 Step-by-Step Installation

1. Shrink Windows Partition

• Search “Disk Management” in Windows
• Right-click C: → Shrink Volume → Free at least 30GB

2. Create Kali Bootable USB

• Open Rufus → Select ISO → Use GPT + UEFI
• Write mode: DD Image (if prompted)

3. Disable Secure Boot

• Enter BIOS (F2/DEL on boot)
• Disable Secure Boot under Boot/Security tab

4. Boot into Kali Installer

• Boot from USB (F12/ESC boot menu)
• Choose “Graphical Install”

5. Partitioning (⚠️ CAREFUL)

• Select “Manual” partitioning
• Choose the free space you created earlier
• Create:
  • root `/` — 20GB ext4
  • swap — 2x RAM size
  • optional: `/home` — remaining space

6. Install GRUB to EFI Partition

• When prompted to install GRUB → choose Yes
• Install to: /dev/sda (or your main disk)

7. Complete Installation & Reboot

You should now see a GRUB boot menu with both Kali & Windows entries!

⚠️ GRUB Not Showing? Here’s the Fix:

🔹 Boot into Kali using USB (Live Mode)

Then run:

sudo mount /dev/sdXn /mnt
sudo mount --bind /dev /mnt/dev
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys /mnt/sys
sudo chroot /mnt
grub-install /dev/sdX
update-grub
exit

Replace /dev/sdXn with your root partition.

🧠 Pro Tips

• Windows Updates can overwrite GRUB — bookmark this post in case you need to recover it
• For daily use, set GRUB timeout to 3s in /etc/default/grub

💬 Final Thoughts

Dual-booting Kali with Windows is possible in 2025 without breaking your system — if you do it the right way. Follow this guide exactly, and you’ll have a hacker-ready system alongside your daily OS.

Need help? Drop your BIOS model and issue at Tsupports.blogspot.com and we’ll walk you through!