GIMP 3.0, after over 4 years of development, is now stable with new major features like GTK3 port, Wayland support, and more.New features include multiple layers selection, new plug-in API, Python 3 support, and render caching for better performance.GIMP 3.0 also introduces Non-destructive layer effects, new snapping options, and multi-threaded JPEG2000 decoding.Installation options for Ubuntu users include Flatpak package, AppImage package, and the unofficial Ubuntu PPA.To install the GIMP Flatpak package, users can use terminal commands to install the daemon package and then the GIMP package from Flathub.For AppImage support, users can download the package, add executable permission, and run it without the need for installation.The Ubuntu PPA for GIMP 3.0 is available for Ubuntu 22.04, 24.04, and 24.10 on amd64, arm64/armhf platforms, with some downsides mentioned.Users can add the PPA by running a terminal command, updating the system, and then installing GIMP 3.0 and required libraries.Other available options include the Snap package (not up-to-date) and the source tarball for download.To uninstall GIMP 3.0, users can run commands to remove the Flatpak package or the .deb package from the PPA.Don't forget to remove the PPA and refresh the system cache after uninstallation.