update Ubuntu24.04

Dockerfile

@@ -1,24 +1,27 @@
 # Dockerfile for GNS3 server development
 
-FROM ubuntu:18.04
+FROM ubuntu:24.04
 
-ENV DEBIAN_FRONTEND noninteractive
+ENV DEBIAN_FRONTEND=noninteractive
 
 # Set the locale
-ENV LANG en_US.UTF-8  
-ENV LANGUAGE en_US:en  
-ENV LC_ALL en_US.UTF-8 
+ENV LANG=en_US.UTF-8
+ENV LANGUAGE=en_US:en
+ENV LC_ALL=en_US.UTF-8
+
+# this environment is externally managed
+ENV PIP_BREAK_SYSTEM_PACKAGES=1
 
 RUN apt-get update && apt-get install -y software-properties-common
 RUN add-apt-repository ppa:gns3/ppa
 RUN apt-get update && apt-get install -y \
     locales \
     python3-pip \
-    python3-dev \ 
+    python3-dev \
     qemu-system-x86 \
     qemu-kvm \
-    libvirt-bin \
-    x11vnc 
+    libvirt-daemon-system libvirt-clients \
+    x11vnc
 
 RUN locale-gen en_US.UTF-8
 
@@ -32,4 +35,4 @@ RUN pip3 install --no-cache-dir -r /server/requirements.txt
 
 EXPOSE 3080
 
-CMD python3 -m gns3server
+CMD [ "python3", "-m", "gns3server", "--port", "3080"]