diff --git a/.gitignore b/.gitignore
index 0122ceb..cd1224e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,7 +6,6 @@ dist/
 compile_commands.json
 
 # SPACEBOX
-BPmono.ttf
 sdl2-config
 
 # External symlinks
diff --git a/Makefile b/Makefile
index 29612ae..a2fea41 100644
--- a/Makefile
+++ b/Makefile
@@ -231,16 +231,16 @@ Cakefoot-linux_debug.x64 : $(LINUX_DEBUG_OBJ)
 	$(CXX) $^ $(LFLAGS) -D__LINUX__ -o $(X64_DEBUG_BUILD_DIR)/$@
 
 # Launch a docker container to build the game on Ubuntu 18.04 for compatibility with older Linux distributions. This requires
-# Docker to be installed on the host system with the image cakefoot-ubuntu18. Use `src/Ubuntu18.Dockerfile` to build the image
+# Docker to be installed on the host system with the image cakefoot-ubuntu18. Use `src/ubuntu18/Dockerfile` to build the image
 # before attempting this build if the image was not built yet.
 #
-#     sudo docker build src/Ubuntu18.Dockerfile
+#     sudo docker build src/ubuntu18/
 
 Ubuntu-18 :
 	sudo docker run --rm -v "$(shell pwd)/$(UBUNTU18_BUILD_DIR):/cakefoot/$(X64_BUILD_DIR)" cakefoot-ubuntu18 sh -c \
 		"cd cakefoot && git submodule foreach --recursive git pull origin main && git pull origin main &&\
-		 make CC=clang-8 CXX=clang++-8 EXTRA_PLATFORM_FLAGS='-D__UBUNTU18__' -j7 Cakefoot-linux.x64"
-
+		make CC=clang-8 CXX=clang++-8 EXTRA_PLATFORM_FLAGS='-D__UBUNTU18__' -j7 Cakefoot-linux.x64 &&\
+		useradd $(USER) && chgrp $(USER) $(X64_BUILD_DIR) -R && chown $(USER) $(X64_BUILD_DIR) -R"
 #############
 # Web build #
 #############
diff --git a/resource/BPmono.ttf b/resource/BPmono.ttf
new file mode 100644
index 0000000..e6bb690
Binary files /dev/null and b/resource/BPmono.ttf differ
diff --git a/src/Ubuntu18.Dockerfile b/src/ubuntu18/Dockerfile
similarity index 93%
rename from src/Ubuntu18.Dockerfile
rename to src/ubuntu18/Dockerfile
index 69aa586..4574ddc 100644
--- a/src/Ubuntu18.Dockerfile
+++ b/src/ubuntu18/Dockerfile
@@ -12,14 +12,14 @@
 #
 # Build with the tag "cakefoot-ubuntu18" for compatbility with the Makefile.
 #
-#     sudo docker build -t cakefoot-ubuntu18 src/Ubuntu18.Dockerfile
+#     sudo docker build -t cakefoot-ubuntu18 src/ubuntu18/
 
 FROM ubuntu:18.04
 
 RUN sed -i '/deb-src/s/^# //' /etc/apt/sources.list && \
     apt update && \
     apt upgrade -y && \
-    apt install -y wget build-essential clang-8 git rsync && \
+    apt install -y wget build-essential clang-8 git rsync zip && \
     apt build-dep -y libsdl2 && \
     apt clean -y && apt autoclean -y && \
     rm -rf /var/lib/apt/lists/* && \