sudo apt get install 报错整理及修复

安装realsense-ros

• 命令：

sudo apt-get install ros-$ROS_DISTRO-realsense2-camera

• 报错

E: Failed to fetch http://packages.ros.org/ros/ubuntu/pool/main/r/ros-melodic-realsense2-camera/ros-melodic-realsense2-camera_2.3.0-1bionic.20210506.155003_amd64.deb  404  Not Found [IP: 140.211.166.134 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

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• 修复step1

sudo apt-get update

• 报错

Reading package lists... Done
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://packages.ros.org/ros/ubuntu bionic InRelease: The following signatures were invalid: EXPKEYSIG F42ED6FBAB17C654 Open Robotics 
W: Failed to fetch http://packages.ros.org/ros/ubuntu/dists/bionic/InRelease  The following signatures were invalid: EXPKEYSIG F42ED6FBAB17C654 Open Robotics 

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• 解决公钥问题

curl -s https://raw.githubusercontent.com/ros/rosdistro/master/ros.asc | sudo apt-key add -

• 继续修复更新

sudo apt-get update

• 成功

Hit:8 https://librealsense.intel.com/Debian/apt-repo bionic InRelease
Get:9 http://packages.ros.org/ros/ubuntu bionic/main i386 Packages [26.4 kB]
Fetched 807 kB in 3s (238 kB/s)    
Reading package lists... Done