I've found a few sources that say to do the following to update GIMP to 2.8:
1.Delete GimpThis hasn't worked for me. I don't seem to be getting an error, but when I open GIMP it's still version 2.6. Does anyone know how I can get version 2.8?
sudo apt-get autoremove gimp gimp-plugin-registry
2.Add the following PPA
sudo add-apt-repository ppatto-kesselgulasch/gimp sudo apt-get update
sudo apt-get install gimp