问题：[ERROR] [1571614395.918484166]: [registerPublisher] Failed to contact master at [localhost:11311]?
[ERROR] [1571614395.918484166]: [registerPublisher] Failed to contact master at [localhost:11311] 解决_勿忘初心,方得始终-CSDN博客
问题：PluginHandlerDirect._restore_settings() plugin "rqt_graph/RosGraph#0" raised an exception: Traceback
解决办法：1.https://github.com/ros-visualization/rqt_common_plugins/issues/393
安装pydot、protobuf、graphviz并查看版本（包括libprotoc）_ShuqiaoS的博客-CSDN博客_查看protobuf版本
2.Kali无法定位软件包的解决方案 - 毒逆天 - 博客园
$变为#方法
1.sudo su?
反过来 1.su user 2.exit 3.Ctrl+D
dpkg：错误：无法新建文件 '/var/lib/dpkg/info/format-new': No such file or directory_活腿肠-CSDN博客
ROS运行rqt rqt_graph出现段错误(核心已转储)解决方法_Linux系统教程_红联Linux门户
报错: service [/spawn] responded with an error: Character [2] is not valid as the first character in Graph Resource Name [2]. ?Valid characters are a-z, A-Z, / and in some cases ~.
解决办法：命名不能是数字，换成字母就可以啦
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