first ARE THEY gimp brushes ?
or some random photoshop brush from the net
photoshop brushes will not work
the brushes NEED to be ".gbr "
save then using gimp to that folder as root
or
as root copy them to the folder
Code:
su -
cd To/The/Locatin/Of/The/Brushes
cp *.gbr /usr/share/gimp/2.0/brushes
HOWEVER YOU HAVE A GIMP FOLDER IN YOUR HOME FOLDER FOR THINGS LIKE THIS
~/.gimp-2.6/brushes
put then in there !