Fonts can be be very easily added to the Kobo family of eReaders. With the Kobo attached to your computer, create a new directory called fonts in the root directory of the device (the same location as the .kobo, .adobe-digital-editions and Digital Editions directories.
Once this directory has been created, simply copy entire font families into it.
A font family consists of four files; one each for Regular, Italic, Bold and BoldItalic.
The font should be named the same as the system sees the font, so in the case of Linux Libertine, it's exactly that. You'll have 4 different font file, and you want to name each one in the style ‹Font Name›-‹Font Weight›, so for Linux Libertine, you should have 4 files:
- Linux Libertine.ttf (or Linux Libertine-Regular.ttf)
- Linux Libertine-Italic.ttf
- Linux Libertine-Bold.ttf
- Linux Libertine-BoldItalic.ttf
For many fonts, the name can simply be what you'd expect it to be, but for some, the actual font name is different than what seems obvious.
Alternatively, the suffixes b, i and z can be used instead of Bold, Italic and BoldItalic.