First of all, I would like to share my font collection for Android KitKat. I have no idea whether or not it would work on earlier version of android since I tested it exclusively on my Galaxy Nexus and Nexus 7 running KitKat.
You just need to flash it via CWM or TWRP.
I also uploaded Andorid Stock fonts (roboto) in case you need to revert back to stock.
- Ubuntu Regular fonts
- Ubuntu Bold Mode fonts
- iOS7 fonts (Helvetica Neue)