fonts-lyx software package provides TrueType versions of some TeX fonts used by LyX, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install fonts-lyx
fonts-lyx is installed in your system.
Make ensure the fonts-lyx package were installed using the commands given below,
$ sudo dpkg-query -l | grep fonts-lyx *
You will get with fonts-lyx package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Fonts |
| Package | fonts-lyx |
| Version | 2.0.3-3 |
| Description | TrueType versions of some TeX fonts used by LyX |
| Sub Section | Fonts |