Install latest/stable of GTK Common Themes Demonstration Program(UNOFFICIAL)
Ubuntu 16.04 or later?
Make sure snap support is enabled in your Desktop store.
Install using the command line
sudo snap install demo-gtk-common-themes
Don't have snapd? Get set up for snaps.
This snap contains the gtk3-demo application, using theme data provided by one or more external snaps.
Refer the following forum topic for more information:
How to use the system GTK theme via the gtk-common-themes snap - doc - snapcraft.io
https://forum.snapcraft.io/t/how-to-use-the-system-gtk-theme-via-the-gtk-common-themes-snap/6235
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