1. Start by creating a backup of your important data to prevent any potential loss.
2. Prepare a bootable USB drive with Ubuntu installation media.
3. Shrink your Windows 10 partition to free up space for Ubuntu. You can do this by opening Disk Management, right-clicking on the Windows partition, and selecting "Shrink Volume."
4. Disable Fast Startup in Windows by going to Control Panel > Power Options > Choose what the power buttons do > Change settings that are currently unavailable > Uncheck "Turn on fast startup."
5. Restart your computer and boot into the Ubuntu installation media.
6. Follow the on-screen instructions to install Ubuntu. When prompted, choose the "Install Ubuntu alongside Windows 10" option.
7. Allocate the desired amount of space to Ubuntu during the installation process.
8. Complete the installation and restart your computer.
9. You will see a boot menu upon restart, allowing you to choose between Windows 10 and Ubuntu.
Note: The actual steps may vary depending on your specific system configuration. It's recommended to consult the official documentation or community forums for your specific laptop/desktop model before proceeding.