OnWorks Windows10 online is a GTK theme created by b00merang with a icon theme pack which can give an Ubuntu installation a complete makeover like Windows 10’s fluent design. It is a dark version of the theme.
As you can see in this OnWorks Windows 10 online it is possible to get a single, Windows-style desktop environment on Ubuntu. It is not a perfect imitation of Windows here but an evidence about how to create a looking for an interface that looks and functions more like Windows.
This is possible because the GNOME Shell desktop supports extensions, which can dramatically change the layout of the desktop and add various other features. Even if you don’t want to use a Windows-style desktop, this is a good example of how powerful GNOME Shell’s extensions and themes are. You can use GNOME Shell Extensions, the GNOME Tweaks application, and themes to customize your desktop in many different ways.