Remove no longer supported packages from Ubuntu 20.04

apt-publisher/Makefile

 apt-ubuntu1804:
 	wget $$SECRET_URL 1>/dev/null 2>/dev/null
 	tar -zxvf *secret.tar.gz
-	make prepare-packages
+	make prepare-packages-ubuntu1804
 	make update-packages-ubuntu1804
 
 apt-ubuntu2004:
 	wget $$SECRET_URL 1>/dev/null 2>/dev/null
 	tar -zxvf *secret.tar.gz
-	make prepare-packages
-	make update-packages-ubuntu1804
+	make prepare-packages-ubuntu2004
+	make update-packages-ubuntu2004
 
-prepare-packages:
+prepare-packages-ubuntu1804:
 	mkdir -p packages
 	cp -prv ffmpeg/pkg/*.deb \
 	        v8pp/pkg/*.deb \
 	        \
 			    packages/
 
+
+prepare-packages-ubuntu2004:
+	mkdir -p packages
+	cp -prv ffmpeg/pkg/*.deb \
+	        v8pp/pkg/*.deb \
+	        allegro5/pkg/*.deb \
+	        sfml/pkg/*.deb \
+	        boost/pkg/*.deb \
+	        fastpfor/pkg/*.deb \
+	        seasocks/pkg/*.deb \
+	        pngpp/pkg/*.deb \
+	        msxsaver/pkg/*.deb \
+	            packages/
+
 docker-ubuntu1804:
 	docker build . -t rayburgemeestre/apt-ubuntu:18.04 -f Dockerfile-ubuntu1804