Install unity-scope-texdoc by entering the following commands in the terminal:
sudo apt update sudo apt install unity-scope-texdoc
Description:
Texdoc scope for Unity
This package contains the "texdoc" scope which allows Unity to search for texdoc content.
Homepage: https://launchpad.net/unity-scope-texdoc
Version: 0.1+14.04.20140328-0ubuntu1
Section: universe/gnome