N: Ignoring file 'ros-latest.list.back' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension

这看起来像是一个警告信息，通常是由于添加了无效的文件扩展名而引起的。在这种情况下，建议检查 `/etc/apt/sources.list.d/` 目录下的 `ros-latest.list` 文件名是否正确，确保它的扩展名是 `.list`。如果文件名没有问题，那么可能是文件内容出现了问题，需要进一步检查。

相关问题

ubuntu中N: Ignoring file 'ros-latest.list.backup' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension E: Type 'http://mirrors.tuna.tsinghua.edu.cn/ros/ubuntu/' is not known on line 1 in source list /etc/apt/sources.list.d/ros-latest.list E: The list of sources could not be read. l

非常抱歉，我之前的回答中有误导之处。对于你遇到的错误，我们需要进行一些修复步骤，请按照以下操作进行：

1. 打开终端。

2. 运行以下命令来备份ROS源列表配置文件：

   sudo mv /etc/apt/sources.list.d/ros-latest.list /etc/apt/sources.list.d/ros-latest.list.backup

3. 运行以下命令来创建一个新的ROS源列表配置文件：

   sudo nano /etc/apt/sources.list.d/ros-latest.list

4. 在打开的文件中，输入以下内容：

   deb http://mirrors.tuna.tsinghua.edu.cn/ros/ubuntu/ YOUR_UBUNTU_VERSION_HERE main

请将 `YOUR_UBUNTU_VERSION_HERE` 替换为你所使用的Ubuntu版本代号，如 `focal`、`bionic`、`xenial` 等。

5. 保存文件并退出编辑器。

6. 接下来，重新更新APT软件包管理器的源列表。运行以下命令：

   sudo apt update

7. 最后，重新安装ROS相关软件包。运行以下命令：

   sudo apt install ros-<distro>-desktop-full

其中 `<distro>` 是你所使用的ROS版本的代号，如 `melodic` 或 `kinetic`。

这样应该能够成功解决问题。如果还有其他问题，请随时提问。非常抱歉给你带来了困扰。

N: Ignoring file 'google-chrome.list.1' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension

This message indicates that the file "google-chrome.list.1" in the directory "/etc/apt/sources.list.d/" has an invalid filename extension. The filename extension is the part of the file name that comes after the last dot, such as ".txt" or ".docx".

In this case, the file name extension ".1" is not recognized as a valid extension. This could be due to a typo or a mistake when the file was created or renamed.

To fix this issue, you may need to rename the file with a valid filename extension, such as ".list". Alternatively, you can simply delete the file if it is not needed.