Install latest/stable of GTK2 Common Themes
Ubuntu 16.04 or later?
Make sure snap support is enabled in your Desktop store.
Install using the command line
sudo snap install gtk2-common-themes
Don't have snapd? Get set up for snaps.
A snap that exports the GTK 2.x themes used on various Linux distros.
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.