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1. adding the ppa to your sources:
open terminal screen (Ctrl + Alt + T) and type the following:
sudo add-apt-repository ppa:otto-kesselgulasch/gimp
sudo apt-get update
At this
stage of the installation, you can either continue in command-line, or
open the software center and install the latest version of gimp from
there:
2.1. Command line:
sudo apt-get install gimp gimp-plugin-registry
2.2. Software center:
(make sure to add the add-ons too)
3. Adding one more very powerful plug-in to the installation:
(optional)
sudo apt-get install gimp-resynthesizer
finished!