Update 2d_appimage.sh

scripts/Linux/internal/2d_appimage.sh

@@ -26,8 +26,18 @@ done
 # Ensure appimagetool is in the PATH
 if ! command -v appimagetool &> /dev/null
 then
-    echo "appimagetool could not be found, please install it."
-    exit 1
+    echo "appimagetool could not be found, attempting to install it..."
+    wget https://github.com/AppImage/appimagetool/releases/download/continuous/appimagetool-x86_64.AppImage \
+        && chmod +x appimagetool-x86_64.AppImage \
+        && sudo mv appimagetool-x86_64.AppImage /usr/local/bin/appimagetool
+
+    if ! command -v appimagetool &> /dev/null
+    then
+        echo "Failed to install appimagetool. Please install it manually."
+        exit 1
+    fi
+else
+    echo "appimagetool is already installed."
 fi
 
 $RESOURCES_PATH/linux/linuxdeploy --appdir=$INSTALL_PATH \