Okay, so i worked it out >
1. Download a brush pack from deviantart, it should be in a .zip file; extract it to your desktop.
2. Make a new folder on your desktop named brushes
3. Place all of your downloaded brushes in the folder 'brushes'.
4. Open GIMP; go to:
File > Preferences > Folders > Brushes
5. Click the only available button, that is the add brush directory button. In the text box next to it, put the directory of your brushes folder. For example, mine is:
/home/jack/Desktop/brushes
6. Make sure the /home/jack/Desktop/brushes is ticked, and press save.
7. Restart GIMP
8. ????????
9. Profit
Installing GIMP Brushes on linux.
Recovered from /miscellaneous-tutorials/14501-installing-gimp-brushes-linux.html · captured 2008.