ros ubuntu18 The following signatures couldn't be verified because the public key is not available

Err:2 http://mirrors.ustc.edu.cn/ros/ubuntu bionic InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654
最近要用到ros，因为系统是ubuntu18.04，所以就安装了ROS Melodic版
基本的安装过程就是参考的https://cloud.tencent.com/developer/article/1387051
镜像使用的是中科大的那个，自认为步骤完全按教程来的，结果一直提示

E: Unable to locate package ros-melodic-desktop-full

之后检查update这一步，发现有如下提示：

Err:2 http://mirrors.ustc.edu.cn/ros/ubuntu bionic InRelease                   
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654

使用如下命令解决

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F42ED6FBAB17C654

之后就可以正常安装了

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