prerequisite

• deb packages:

apt install debhelper cdbs lintian build-essential fakeroot devscripts pbuilder dh-make debootstrap

• gpg key (note you key sub part after slash):

gpg --gen-key

• pbuilder:

echo "COMPONENTS=\"main restricted universe multiverse\"" | sudo tee -a /etc/pbuilderrc
sudo pbuilder create
sudo pbuilder update

prepare package

Edit build.sh with your vars edit files in template to match glpi version

generate package

./build.sh