Update Dockerfile

Dockerfile

@@ -18,6 +18,7 @@
 # Use the official Ubuntu image.
 # Use the official Ubuntu image.
 # Use the official Ubuntu image.
+# Use the official Ubuntu image.
 FROM ubuntu:20.04
 
 # Set the timezone
@@ -28,6 +29,13 @@ RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
 RUN echo "keyboard-configuration keyboard-configuration/layout select us" | debconf-set-selections
 RUN echo "keyboard-configuration keyboard-configuration/variant select English (US)" | debconf-set-selections
 
+# Pre-seed the display manager
+RUN echo "gdm3 shared/default-x-display-manager select gdm3" | debconf-set-selections
+
+# Pre-seed the desktop environment
+RUN echo "xfce4 xfce4/desktop_icons_show_home boolean false" | debconf-set-selections
+RUN echo "xfce4 xfce4/desktop_icons_show_trash boolean false" | debconf-set-selections
+
 # Install dependencies in non-interactive mode
 RUN DEBIAN_FRONTEND=noninteractive apt-get update && apt-get install -y \
     xfce4 \
@@ -37,6 +45,7 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get update && apt-get install -y \
     curl \
     tzdata \
     keyboard-configuration \
+    gdm3 \
     && rm -rf /var/lib/apt/lists/*
 
 # Set up VNC