安装：
https://dandelioncloud.cn/article/details/1626038006681153537
https://blog.csdn.net/zephyr_wang/article/details/130069792
运行 sudo apt update的时候出现下面的错误：
Err:11 http://packages.ros.org/ros2/ubuntu xenial InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654
https://blog.csdn.net/shanpenghui/article/details/90755148