added Firewall chooser

chooseFirewall will ask the user if he wants to enable the Firewall an will enable it if the answer is yes, no action are taken if the answer is no

scripts/linuxparty.py

@@ -142,6 +142,15 @@ def showErrorBox(errorstring):
     errorBox.setIcon(3)
     sys.exit(errorBox.exec_())
 
+def chooseFirewall():
+    askBox = QtWidgets.QMessageBox()
+    askBox.setText("Netzwerk: Soll die Ubuntu Firewall (ufw/gufw) aktiviert werden?")
+    askBox.setIcon(4)
+    askBox.setStandardButtons(QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No)
+    result = askBox.exec_()
+    if result == QtWidgets.QMessageBox.Yes:
+        enableFirewall()
+
 def checkIfRoot():
     if os.getuid() != 0:
         errorBox = QtWidgets.QMessageBox()
@@ -167,6 +176,10 @@ def installPackages(strlist):
     except Exception as ex:
         print("Error during install",ex)
 
+def enableFirewall():
+    command=['ufw', 'enable']
+    subprocess_wrap(command)
+
 def mountStick():
     command=[basedir+"/infuse_offline_repo.sh"]
     subprocess_wrap(command)
@@ -246,6 +259,7 @@ if __name__ == '__main__':
     basepath=os.path.realpath(__file__)
     basedir=os.path.dirname(basepath)
     checkIfRoot()
+    chooseFirewall()
     mountStick()
     window = Main()
     window.setWindowTitle("Linux Install Party Software Installer")