我是 unbuntu 的新手。如果可能的话，请帮助我解决这个问题。我在网上阅读了许多解决方案，但我很难理解大多数人写的内容。
我试图从终端运行可执行文件，但这是随后出现的错误消息。
./magfieldmapper_gui: error while loading shared libraries: liblapacke.so.3: cannot open shared object file: No such file or directory
请指教。感谢您的时间。
我应该使用什么命令来更改描述（第 5 行）
cat package.xml<?xml version="1.0"?>
<package format="2">
<name>beginner_tutorials</name>
<version>0.0.0</version>
<description>The beginner_tutorials package</description>
<!-- One maintainer tag required, multiple allowed, one person per tag -->
<!-- Example: -->
<!-- <maintainer email="[email protected]">Jane Doe</maintainer> -->
<maintainer email="[email protected]">adriel</maintainer>
<!-- One license tag required, multiple allowed, one license per tag -->
<!-- Commonly used license strings: -->
<!-- BSD, MIT, Boost Software License, GPLv2, GPLv3, LGPLv2.1, LGPLv3 -->
<license>TODO</license>
<!-- Url tags are optional, but multiple are allowed, one per tag -->
<!-- Optional attribute type can be: website, bugtracker, or repository -->
<!-- Example: -->
<!-- <url type="website">http://wiki.ros.org/beginner_tutorials</url> -->
<!-- Author tags are optional, multiple are allowed, one per tag -->
<!-- Authors do not have to be maintainers, but could be -->
<!-- Example: -->
<!-- <author email="[email protected]">Jane Doe</author> -->
<!-- The *depend tags are used to specify dependencies -->
<!-- Dependencies can be catkin packages or system dependencies -->
<!-- Examples: -->
<!-- Use depend as a shortcut for packages that are both build and exec dependencies -->
<!-- <depend>roscpp</depend> -->
<!-- Note that this is equivalent to the following: -->
<!-- <build_depend>roscpp</build_depend> -->
<!-- <exec_depend>roscpp</exec_depend> -->
<!-- Use build_depend for packages you need at compile time: -->
<!-- <build_depend>message_generation</build_depend> -->
<!-- Use build_export_depend for packages you need in order to build against this package: -->
<!-- <build_export_depend>message_generation</build_export_depend> -->
<!-- Use buildtool_depend for build tool packages: -->
<!-- <buildtool_depend>catkin</buildtool_depend> -->
<!-- Use exec_depend for packages you need at runtime: -->
<!-- <exec_depend>message_runtime</exec_depend> -->
<!-- Use test_depend for packages you need only for testing: -->
<!-- <test_depend>gtest</test_depend> -->
<!-- Use doc_depend for packages you need only for building documentation: -->
<!-- <doc_depend>doxygen</doc_depend> -->
<buildtool_depend>catkin</buildtool_depend>
<build_depend>roscpp</build_depend>
<build_depend>rospy</build_depend>
<build_depend>std_msgs</build_depend>
<build_export_depend>roscpp</build_export_depend>
<build_export_depend>rospy</build_export_depend>
<build_export_depend>std_msgs</build_export_depend>
<exec_depend>roscpp</exec_depend>
<exec_depend>rospy</exec_depend>
<exec_depend>std_msgs</exec_depend>
<!-- The export tag contains other, unspecified, tags -->
<export>
<!-- Other tools can request additional information be placed here -->
</export>
</package>
我最近安装了 Ubuntu 16.04 版并尝试在我的笔记本电脑上安装 ROS 动力学。但是，我在运行sudo apt-get update.
这是结果：
Err:1 http://packages.ros.org.ros/ubuntu xenial InRelease
Could not resolve 'packages.ros.org.ros'
Hit:2 http://security.ubuntu.com/ubuntu xenial-security InRelease
Hit:3 http://id.archive.ubuntu.com/ubuntu xenial InRelease
Hit:4 http://id.archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit:5 http://id.archive.ubuntu.com/ubuntu xenial-backports InRelease
Reading package lists... Done
W: Failed to fetch http://packages.ros.org.ros/ubuntu/dists/xenial/InRelease Could not resolve 'packages.ros.org.ros'
W: Some index files failed to download. They have been ignored, or old ones used instead.
我已经在网上搜索了很长时间的解决方案，但似乎仍然无法解决问题。