Process:
sudo add-apt-repository ppa:otto-kesselgulasch/gimpOne command at a time, or add a double ampersand (&&) between each item and concatenate it onto one line.
sudo apt-get update
sudo apt-get install gimp
I find GIMP to be a good professional style image manipulation program, however, it doesn't beat simple tools like IRFanView for simple resize/cropping activities. I found this PPA useful, so just posting for others.