If you maybe dont like default Ubuntu theme which comes preinstalled. In this post we choose the 10 best Ubuntu theme for your Linux Desktop.
This is not an exhaustive list and may exclude some of the themes you already like and use, but hopefully, you will find at least one theme that you enjoy.

You like Apple style and design?
If you want to transform your Ubuntu into the Macbook style desktop environment
then macOS high Sierra GTK theme is theme for you.
You can download this theme here

You love linux but you want Windows 10 look. This theme is right choice for you.
The superiority of the Linux shows that you can do whatever you like to do with your OS. You can change look completely and that’s called freedom
You can download this theme here

Paper theme and icons are designed for Linux desktop environment.This theme comes with a modern GTK+ interface and Google’s material design.
Paper theme is supported by most of the popular desktop environment like unity, GTK 2.X, GTK 3.X. To tweak your ubuntu desktop environment to Paper theme, you need to install the theme pack, icon pack and unity tweak tool.
How To Install Paper Theme In Ubuntu
sudo add-apt-repository ppa:snwh/pulp sudo apt-get update sudo apt-get install paper-icon-theme sudo apt-get install paper-cursor-theme sudo apt-get install paper-gtk-theme
How to download as Debian Package
sudo dpkg -i paper*.deb sudo apt-get install -f
To install unity tweak tool open terminal (Ctrl + Alt + T) and type in following commands
sudo apt-get install unity-tweak-tool

Flat Remix theme is flat Gnome Shell theme which makes your Linux desktop amazing . It is designed and inspired by material design at the same time.
It is modern, beautiful and simple theme with a modern “flat” colors with high contrasts and sharp borders.
How To Install Flat Remix Gnome Theme In Ubuntu
sudo add-apt-repository ppa:noobslab/themes sudo apt-get update sudo apt-get install flat-remix-gs-theme
How to install on Arch-based distributions (AUR)
gnome-shell-theme-super-flat-remix-git
Flat Remix GNOME theme download here
Flat Remix GNOME icon theme download here

If you love of KDE & Gnome shell you should install this theme to make your Linux desktop awesome. Oxygenium provides some unique features that make your Gnome shell fully customized.
Download theme here

Minimal Conception, aims to introduce you to simple interface so you can enjoy a better Linux experience.
Download theme here

This theme is available in 3 variants Human-Mobile shell theme, Human-Black shell theme and Human-NEXT shell theme and works best with macOS-like icons and macOS-like docks.
Download theme here

Arc is the most popular and modern flat GTK Theme which is an elegant and well designed GTK Theme. It comes with 3 different themes. These are Arc Dark, Arc Darker and Arc Darkest.
You want to make your Linux desktop more dynamic, Arc theme will be the best option.
How to install on Ubuntu 18.04.
$ sudo sh -c "echo 'deb http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_18.04/ /' > /etc/apt/sources.list.d/home:Horst3180.list" $ sudo apt-get update $ sudo apt-get install arc-theme
Download theme here

United GNOME is a GTK3 theme inspired by a Unity 8 design concept of Ubuntu 18.04 and the material design-inspired Flat-Plat theme.
United Gnome will provide you a Unity desktop environment on Linux.
The United GNOME theme is available in a number of versions, including light, dark and darker (a mix of light & dark).
Download theme here

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