ROS rqt_graph不再启动(ImportError DEFAULT_MASTER_PORT)

Question

最近，我从Universal上安装了离线模拟器，install.sh最终删除了我的整个ROS安装。很好。我按照官方指南重新安装了它，现在rqt_graph不工作了：

usr@legion:~/Documents/catkin_ws$ rqt_graph
Traceback (most recent call last):
  File "/opt/ros/melodic/bin/rqt_graph", line 5, in <module>
    from rqt_gui.main import Main
  File "/opt/ros/melodic/lib/python2.7/dist-packages/rqt_gui/main.py", line 41, in <module>
    import rospy
  File "/opt/ros/melodic/lib/python2.7/dist-packages/rospy/__init__.py", line 49, in <module>
    from .client import spin, myargv, init_node, \
  File "/opt/ros/melodic/lib/python2.7/dist-packages/rospy/client.py", line 60, in <module>
    import rospy.impl.init
  File "/opt/ros/melodic/lib/python2.7/dist-packages/rospy/impl/init.py", line 58, in <module>
    from rosgraph.rosenv import DEFAULT_MASTER_PORT  # default port for master's to bind to
ImportError: cannot import name DEFAULT_MASTER_PORT

(roscore正在另一个终端中运行)我尝试过sudo apt安装roscore和sudo apt安装python，但是错误仍然存在。

我挖掘并发现，这个特定的变量已经添加到该文件的旋律发行，所以可能有一个版本冲突，但我不知道如何检查。

怎么继续？

Answer 1

我最后做了sudo apt更新和sudo apt升级，一些ros软件包已经更新，现在起作用了。这可能对某些人有用:)