Install latest/edge of gtk-theme-nordic
Ubuntu 16.04 or later?
Make sure snap support is enabled in your Desktop store.
Install using the command line
sudo snap install gtk-theme-nordic --edge
Don't have snapd? Get set up for snaps.
This snap provides the GTK themes for Nordic from https://www.gnome-look.org/p/1267246/ in a form that can be used by other snapped applications.
Generate an embeddable card to be shared on external websites.
Choose your Linux distribution to get detailed installation instructions. If yours is not shown, get more details on the installing snapd documentation.