Install Linux as dual boot with Windows

 Although Windows can run Linux as a subsystem, it may not work properly when GUI is needed. To install Ubuntu as a dual boot system is very straightforward:

1. Download Linux ISO file.

2. Use Etcher to create a bootable USB for Linux. Etcher supports Windows, MacOS and Linux.

3. After using the USB to boot up Windows PC, it allows you to adjust partition of your C: drive to make space for Linux. No need to use other disk partition tools anymore!

After the installation and rebooting, the dual boot menu may not show up and the PC still boots into Windows. Do the following:

4. Go to Setup --> Windows Update --> Recovery, and choose to restart.

5. After rebooting into the recovery mode, choose Troubleshoot --> Advanced --> Repair Disk Image.

Then the system will reboot again. This time the dual boot menu shows up! Done!