Installing The Material Design-Based Adapta GTK Theme on Ubuntu
This might come as a surprise to you because we have never written about it here, but Adapta is one Linux’s most popular GTK themes. We are writing about it now because it just saw its latest release.
Material Inspired Theme
Adapta is an open-source GTK theme is completely inspired by Google’s Material Design guidelines and so it would not be one for you if you aren’t a lover of Material Design icons’ shadow-heavy look and feel.
The theme is available in two distinct versions (just like with Arc and Arc Darker): regular Adapta and a half-dark/half-light Adapta-Nokto variant. Both variants look identical in the Unity desktop but distinct in Cinnamon, GNOME Shell or Budgie desktops. Either way, the theme itself, works perfectly with any modern desktop environment you can think about.
Installing Adapta GTK Theme on Ubuntu
All you have to do to install the Adapta GTK theme on your Ubuntu 16.04 LTS or Ubuntu 16.10 is run the following commands in your terminal:
sudo apt-add-repository ppa:tista/adapta
sudo apt update && sudo apt install adapta-gtk-theme
As usual, you will need to use a utility like Unity Tweak Tool (which is available to install for free from the Ubuntu Software app)to change GTK theme on your system.