sudo add-apt-repository ppa:otto-kesselgulasch/gimp
sudo apt-get update
sudo apt-get install gimp gimp-gmic
wget -O gimp-2.8.zip http://drive.noobslab.com/data/themes/gimp/gimp-2.8.zip
unzip gimp-2.8.zip -d ~/ && rm gimp-2.8.zip
mkdir -p $HOME/.config/GIMP/2.10/plug-ins/
wget https://gmic.eu/files/linux/gmic_3.3.6_gimp2.10_debian11_bullseye_amd64.zip
unzip gmic_3.3.6_gimp2.10_debian11_bullseye_amd64.zip -d $HOME/.config/GIMP/2.10/plug-ins/