fonts-lmodern software package provides OpenType fonts based on Computer Modern, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install fonts-lmodern
fonts-lmodern is installed in your system.
Make ensure the fonts-lmodern package were installed using the commands given below,
$ sudo dpkg-query -l | grep fonts-lmodern *
You will get with fonts-lmodern package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Fonts |
| Package | fonts-lmodern |
| Version | 2.004.5-1 |
| Description | OpenType fonts based on Computer Modern |
| Sub Section | Fonts |