From The Document Foundation Wiki
- Download liberation-fonts-ttf-2.00.1.tar.gz from the TDF NextCloud server.
- Decompress this file, which contains a folder of .ttf (TrueType Font) files.
- Install the font files, using the procedures appropriate to your operating system. On Windows and macOS, this can be done by double-clicking on the font name and then clicking the Install Font button on the window that opens. If you know where fonts are stored on your system, you can also copy the font files into the appropriate folder; on Linux, copying font files into the appropriate folder is the standard way to install them.