Install libraven0 by entering the following commands in the terminal:
sudo apt update sudo apt install libraven0
Description:
Raven library for budgie-desktop
Budgie-Desktop is a GTK+ based desktop environment which focuses on simplicity and elegance. It provides a traditional desktop metaphor based interface utilising customisable panel based menu driven system. Budgie-Desktop is written from scratch utilising many GNOME based sub-systems such as GNOME-Session and Mutter. . This provides the budgie-desktop user-defined settings called raven.
Homepage: https://solus-project.com/budgie/
Version: 10.4+git20171031.10.g9f71bb8-1.2ubuntu1
Section: universe/libs