Nyt löysin vastauksen. Sitä ei ole päivitetty 16.04 eli pitää odotella 18.04 versiota.
sudo add-apt-repository ppa:otto-kesselgulasch/gimp
sudo apt update
sudo apt install gimp
not upgrading to GIMP 2.10, still installs GIMP 2.8
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Take note of all your plugins for re-installation after installing v2.10.
Proceed to purge v2.8 and all currently installed plugins.
Note: Do all this before adding the repository!
Add the add-apt-repo > apt update > apt install v2.10. Should work without a hitch
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Shamim Ahmed Laskar
Tried and failed. My OS is Elementary OS Loki, based on Ubuntu 16.04.4 LTS (Xenial Xerus), that’s maybe the reason for not upgrading to 2.10.