软件包 python-catkin-pkg 没有可安装候选

回答: 根据您提供的信息，安装catkin-tools时遇到了软件包python-catkin-pkg无法安装的问题。这可能是由于依赖关系的问题导致的。\[1\]要解决这个问题，您可以尝试更新Debian软件包管理器。您可以通过打开系统自带的Software Updater，然后在Other updates中的Ubuntu base找到Debian package management system，并进行更新。\[3\]更新后，您应该能够成功安装python-catkin-pkg并继续安装catkin-tools。
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