More info please. What distro are you using? What font(s) do you want to install? Is GIMP not working because of the missing fonts, or do you just want to use a particular font in it? (Please read the "How to ask a question" link in my signature below).
Most distributions offer a large selection of fonts through their package managers that you can install just like any other package. KDE, for example, also allows you to install external fonts (i.e. web fonts) through it's control center.
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