Dual Booting Kali Linux and Windows 10 on Spare Lenovo Laptop

Do the following on the PC or laptop that you intend to use in dual boot.
But its good idea to first practice on a disposable one.
Here is screen shot of my folder with all the necessary components.

1. Make a Kali Linux bootable USB with Kali Linux distribution.

2. Follow these instructions.

3. Hold the Shift key and click Restart from a shutdown button on your Windows desktop.

This is doing the same thing as going to Recovery Settings | Advanced Startup | Reboot | Advanced Startup

Here are my steps while following the instructions from the above links.

1. Using the USB creator program, create two USB sticks: One with a Live ISO; One with an install ISO
2. Insert the live USB stick. Then hold Shift key + Restart to boot from live usb stick
3. Run gParted from inside the live OS.
4. Resize the free unallocated space AFTER the Windows partition to approximately 100,000 mb(100GB) not 1000 mb (1GB).
5. Click apply and wait for 5 minutes or more.
6. Shut down machine and remove live USB.
7. Turn on machine into Windows and insert the install USB.
8. Then hold Shift key + Restart to boot from install usb stick.
9. Follow guided install instructions.
10. When finished remove the install USB and restart the machine.

Now one of three things should happen.

1. You get GRUB bootloader screen with option to boot either Kali or Windows.

2. You boot right back into Windows 10

3. Nothing happens

If you automatically boot into Windows 10, then you will have to SHIFT & Restart.

From the Windows "Choose and Option" panel, select "Use a device" | kali or if you want Windows boot normally.

Should #3 occur, remove the power cord from the laptop or PC, wet the socket with saliva, blow on it and then kiss your machine good bye.

If you have a successful Kali installation, you must recognize that Linux gets it programs over the internet from

/etc/apt/sources.list

This file may not have the required URLs

If that be the case, then you will need to run the following from a command line

sudo tee -a /etc/apt/sources.list≪EOF
deb http://http.kali.org/kali kali-rolling main non-free contrib
deb-src http://http.kali.org/kali kali-rolling main non-free contrib
EOF

Using a text editor, check /etc/apt/sources.list to make sure there are URLs.

Then...

sudo apt update

sudo apt -y upgrade
sudo systemctl reboot