Comment 22 for bug 1614593

sudo add-apt-repository ppa:otto-kesselgulasch/gimp-edge
sudo apt update
sudo apt dist-upgrade

BUT: This is a development version of gimp, without adjustments for ubuntu and can come with other bugs! The look and feel is different from the ubuntu version.

If you like to remove this version after a test do this:

sudo rm /etc/apt/sources.list.d/otto-kesselgulasch-ubuntu-gimp-edge-*
sudo apt purge gimp
sudo apt install gimp