Install fonts-cmu by entering the following commands in the terminal:
sudo apt update sudo apt install fonts-cmu
Description:
sets the computer modern unicode fonts
Provides a set of Computer Modern Unicode fonts. It provides OpenType files. . They are based on the METAFONT version of the Computer fonts and contain many additional characters. . The fonts contain glyphs from Latin1, Cyrillic and Greek code sets.
Homepage: http://sourceforge.net/projects/cm-unicode/
Version: 0.7.0-3
Section: universe/fonts