As you may know, GIMP is an open-source photo manipulation software, being a good alternative to Adobe Photoshop.
The latest version available is GIMP 2.8.18, which has been released a while ago.
Screenshots:
Installation instructions:
Up to date packages are available via Otto’s PPA, so installing the software on Ubuntu 17.04 Zesty Zapus, Ubuntu 16.10 Yakkety Yak, Ubuntu 16.04 Xenial Xerus, Ubuntu 14.04 Trusty Tahr, Linux Mint 17.x, Linux Mint 18, Elementary OS 0.3 Freya and Elementary OS 0.4 Loki systems should not cause too many problems.
All you need to do is add the PPA to your system, update the local repository index and install the gimp package:
$ sudo add-apt-repository ppa:otto-kesselgulasch/gimp
$ sudo apt-get update
$ sudo apt-get install gimp
Optional, to remove gimp, do:
$ sudo apt-get remove gimp