This is the easiest way to install fonts ever! I dont know if these steps can also be done in Ubuntu prior to this version.
- Open your Nautilus (Files and folder browser). Places > Home Folder.
- From the menu, choose : View > Show Hidden Files. Or simply just press Ctrl+H.
- Create new folder folder named “.fonts” (with dot / hidden files).
- Just copy your ttf fonts to this folder.
- Run GIMP or any other text manipulation software (ie. Office) to make sure this works.