diff --git a/xfce4-panel.xml b/post_installation_script/xfce4-panel.xml
similarity index 100%
rename from xfce4-panel.xml
rename to post_installation_script/xfce4-panel.xml
diff --git a/post_installation_script_test/02_start_container_with_image.sh b/post_installation_script_test/02_start_container_with_image.sh
index 20c9303..861a518 100755
--- a/post_installation_script_test/02_start_container_with_image.sh
+++ b/post_installation_script_test/02_start_container_with_image.sh
@@ -2,6 +2,6 @@
 
 # Start container with the test image (interactive shell)
 docker run -it --rm \
-  --cap-drop ALL --security-opt no-new-privileges --tmpfs /tmp:rw \
-  -v "$(pwd)/../post_installation_script/20251212_Nachinstallationsarbeiten_LC_Esslingen_XFCE_v8.sh":/workspace/script.sh:ro \
+  --tmpfs /tmp:rw \
+  -v "$(pwd)/../post_installation_script/":/workspace/:ro \
   mint-script-test
diff --git a/post_installation_script_test/Dockerfile b/post_installation_script_test/Dockerfile
index 771c9a3..d4908da 100644
--- a/post_installation_script_test/Dockerfile
+++ b/post_installation_script_test/Dockerfile
@@ -1,41 +1,12 @@
 FROM ubuntu:22.04
 
-# Minimal image for safe simulation of apt installs.
+# Install required utilities including sudo
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    bash wget tar curl gnupg ca-certificates apt-utils apt coreutils file procps && \
+    bash wget tar curl gnupg ca-certificates apt-utils apt coreutils file procps sudo && \
     apt-get clean && rm -rf /var/lib/apt/lists/*
 
-# sudo wrapper: simulate apt installs and avoid making changes to the image
-RUN cat > /usr/local/bin/sudo <<'EOF'
-#!/bin/sh
-# sudo wrapper for simulation:
-# - simulate installs with `apt-get -s install ...`
-# - run `apt-get update` quietly (needed so apt -s has metadata)
-# - otherwise echo the command (no-op)
-cmd="$1"
-arg2="${2:-}"
-if [ "$cmd" = "apt" ] || [ "$cmd" = "apt-get" ]; then
-  if [ "$arg2" = "install" ]; then
-    shift 2
-    echo "[sudo-wrapper] simulating: apt-get -s install $@"
-    apt-get -s install "$@"
-    exit $?
-  elif [ "$arg2" = "update" ]; then
-    # do not run update at runtime (may require extra privileges); simulate instead
-    echo "[sudo-wrapper] simulating: apt-get update (no-op in container)"
-    exit 0
-  else
-    echo "[sudo-wrapper] would run: $@"
-    exit 0
-  fi
-else
-  echo "[sudo-wrapper] would run: $@"
-  exit 0
-fi
-EOF
-RUN chmod +x /usr/local/bin/sudo
-
-ENV PATH=/usr/local/bin:$PATH
+# Configure passwordless sudo for all users (needed for script)
+RUN echo 'ALL ALL=(ALL) NOPASSWD: ALL' >> /etc/sudoers
 
 WORKDIR /workspace
 ENTRYPOINT ["/bin/bash"]
diff --git a/post_installation_script_test/README.md b/post_installation_script_test/README.md
index f1df0af..ff41e8b 100644
--- a/post_installation_script_test/README.md
+++ b/post_installation_script_test/README.md
@@ -13,7 +13,7 @@ This directory contains everything needed to test the post-installation script i
 Provides a reproducible testing environment that allows:
 
 - Running the post-installation script without affecting the host system
-- Simulating `apt` installations (safe, no real package changes)
+- Real `apt` installations (isolated in container)
 - Testing script logic, prompts, and error handling
 - Validating syntax and tracing execution
 
@@ -22,8 +22,8 @@ Provides a reproducible testing environment that allows:
 The Dockerfile includes:
 
 - Ubuntu 22.04 base image
-- Simulated `sudo` wrapper that runs `apt-get -s install` (simulates installs without making changes)
-- Useful utilities: `bash`, `wget`, `tar`, `curl`, `gnupg`, `ca-certificates`, `file`, `procps`
+- Passwordless sudo for real apt installations
+- Useful utilities: `bash`, `wget`, `tar`, `curl`, `gnupg`, `ca-certificates`, `file`, `procps`, `sudo`
 
 ## Usage
 
@@ -49,12 +49,13 @@ sh 02_start_container_with_image.sh
 After container is started an interactive session was started in the container and the script can be started for testing
 
 ```bash
-sh script.sh
+ls -al
+sh <scriptName>.sh
 ```
 
 ## Security Notes
 
 - The script is mounted read-only (`:ro` flag) to prevent container from modifying host files
-- Container runs with reduced privileges (`--cap-drop ALL --security-opt no-new-privileges`)
-- The `sudo` wrapper simulates apt operations, so no packages are actually installed
+- All apt installations are real but isolated in the container
 - Use `--tmpfs /tmp:rw` for any temporary writes inside the container
+- Container is automatically removed after exit (`--rm` flag)