安装 ROS 2 的问题“E：无法找到包 ros-foxy-desktop”
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【中文标题】安装 ROS 2 的问题“E：无法找到包 ros-foxy-desktop”【英文标题】：Problem with instalation ROS 2 "E: Unable to locate package ros-foxy-desktop" 【发布时间】：2021-09-22 01:10:29 【问题描述】：我尝试在 ubuntu focus fosa (20.04) 上安装 ROS 2。
I went along with this instruction，但是 执行此命令后：
sudo apt update
我遇到了这个问题：
Hit:1 http://ru.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://ru.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:3 http://ru.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:4 http://download.opensuse.org/repositories/home:/Alexx2000/xUbuntu_20.04 InRelease
Hit:5 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:6 http://packages.osrfoundation.org/gazebo/ubuntu-stable focal InRelease
Get:7 http://packages.ros.org/ros2/ubuntu focal InRelease [4,670 B]
Err:7 http://packages.ros.org/ros2/ubuntu focal InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654
Reading package lists... Done
W: GPG error: http://packages.ros.org/ros2/ubuntu focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654
E: The repository 'http://packages.ros.org/ros2/ubuntu focal InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
然后：sudo apt install ros-foxy-desktop
我明白了：
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package ros-foxy-desktop
【问题讨论】：
【参考方案1】：我修好了。基本上，我添加了新的存储库密钥并删除了旧的。这对我有用：
https://answers.ros.org/question/379190/apt-update-signatures-were-invalid-f42ed6fbab17c654/
【讨论】：
【参考方案2】：请验证 ros-latest.list：
sudo gedit /etc/apt/sources.list.d/ros-latest.list
输出：deb http://packages.ros.org/ros/ubuntu focal main
另外，别忘了运行sudo apt update
这对我有用。
【讨论】：
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