Install signon-ui-service by entering the following commands in the terminal:
sudo apt update sudo apt install signon-ui-service
Description:
D-Bus service file for signon-ui
This D-Bus service is used to provide a UI for authenticating online accounts.
Homepage: https://launchpad.net/signon-ui
Version: 0.17+18.04.20171027+really20160406-0ubuntu1
Section: universe/gnome