Install gsettings-ubuntu-schemas by entering the following commands in the terminal:
sudo apt update sudo apt install gsettings-ubuntu-schemas
Description:
GSettings deskop-wide schemas for Ubuntu
gsettings-ubuntu-schemas contains a collection of GSettings schemas for settings shared by various components of an Ubuntu environment.
Homepage: https://launchpad.net/gsettings-ubuntu-touch-schemas
Version: 0.0.7+17.10.20170922-0ubuntu1
Section: gnome