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WARNING
This is a complicated process that, if performed incorrectly, may leave your Windows partition damaged or overwritten. Remember to backup your data on your Windows partition to another drive before attempting to install Ubuntu alongside Windows. Backing up files to a USB drive is easy and it is described in this video here.
The same process can be followed for Ubuntu 22.04+ & Windows 11 (UPDATES COMING SOON)
*SOME IMAGES MISSING ):
Summary of Steps to Dual Boot Ubuntu 20.04 and Windows 10
1. Make an Ubuntu bootable USB drive in Windows
2. Create Free Space for Ubuntu by shrinking Windows NTFS Partition
3. Install Ubuntu Linux using a USB drive
Step1: Make a Ubuntu bootable USB drive in Windows
1.1 Download Ubuntu 20.04 Desktop ISO from https://ubuntu.com/download/desktop or from local repository.
1.2 Download Rufas from https://rufus.ie/
1.3 Create a bootable Ubuntu USB drive using Rufas. Launch Rufas from your Downloads folder. Select the Device by clicking the drop-down arrow. Be careful to choose the correct USB device. Then press the SELECT button to choose the Ubuntu 20.04 ISO in your Downloads directory. Then click on the START button to begin the copy process. Accept any recommendations if prompted.
Step2: Create Free Space for Ubuntu by shrinking Windows NTFS Partition
2.1 Boot from the newly created USB drive. Restart your computer and press F12 on startup to enter the boot menu. From here select your USB drive.
2.2 Next when the installer launches select the Try Ubuntu button.
2.3 When the desktop launches press the superkey + a to show applications. The superkey is also known as the windows key. In the type to search field, type gparted and click on the gparted icon.
2.4 When GParted launches select the largest NTFS partition. Be careful do not select any other partitions labeled Recovery, EFI, or Microsoft Reserved. Then select the resize icon on the toolbar. The resize icon is marked with a rectangle in the image below.
2.5 Next the resize dialog window will appear. Select the arrow on the right and drag towards the left.
2.6 It will display the free space that will be created. Create free space per your requirements but be careful to leave free space on your Windows partition. In the image below I created around 20G of free space that will be used for the Ubuntu partition.
2.7 Once you set the free space size, select the Resize/Move button.
2.8 The resize is not complete yet. To apply the resize click on the check on the toolbar.
2.9 Then you will receive a message like the one in the image below. Select the apply button.
2.10 When the resize is done your will receive the Completed Operations message. Click on the close button. Then close the GParted application.
Step3: Install Ubuntu Linux using a USB drive
3.1 While still running in the Ubuntu USB drive, return back to the desktop select the Install Ubuntu 20.04.1 LTS icon.
3.2 When the Ubuntu installer loads you will then be presented with options to select your language, keyboard, and Updates and other software. I suggest you select to install third-party software for graphics and WiFi hardware. Then press the Continue button.
3.3 Install Ubuntu alongside Windows. The next screen is important and you want to make sure to select Install Ubuntu alongside Windows Boot Manager. Finally, click Install Now to finish the installation.
3.4 After Ubuntu is installed make sure to remove the USB drive. When you reboot your computer you will be presented with the GRUB menu from which you can choose to load Ubuntu or the Windows Boot Manager.
