ubuntu18.04运行cartogapher slam 程序报错.so文件不存在的问题，软链接问题。libEGL.so,libGL.so

• 主要报错
• • 完整报错
  • 解决方法
  • • 1.来到文件位置
    • 4.重新建立链接，但报错
    • 5.重新链接
    • 6.查看链接状态

“/usr/lib/x86_64-linux-gnu/libGL.so” but this file does not exist.

CMake Error at /usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5GuiConfig.cmake:27 (message):
The imported target “Qt5::Gui” references the file

 **"/usr/lib/x86_64-linux-gnu/libGL.so"**

but this file does not exist. Possible reasons include:

• The file was deleted, renamed, or moved to another location.

• An install or uninstall procedure did not complete successfully.

• The installation package was faulty and contained

  “/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake”

but not all the files it references.

Call Stack (most recent call first):
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake:50 (_qt5_Gui_check_file_exists)
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake:74 (_qt5gui_find_extra_libs)
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5GuiConfig.cmake:184 (include)
/usr/lib/x86_64-linux-gnu/cmake/Qt5Widgets/Qt5WidgetsConfig.cmake:101 (find_package)
/usr/lib/cmake/vtk-6.3/Modules/vtkGUISupportQt.cmake:17 (find_package)
/usr/lib/cmake/vtk-6.3/vtkModuleAPI.cmake:45 (include)
/usr/lib/cmake/vtk-6.3/vtkModuleAPI.cmake:15 (vtk_module_load)
/usr/lib/cmake/vtk-6.3/vtkModuleAPI.cmake:132 (_vtk_module_config_recurse)
/usr/lib/cmake/vtk-6.3/VTKConfig.cmake:80 (vtk_module_config)
/usr/lib/x86_64-linux-gnu/cmake/pcl/PCLConfig.cmake:501 (find_package)
/usr/lib/x86_64-linux-gnu/cmake/pcl/PCLConfig.cmake:656 (find_VTK)
/usr/lib/x86_64-linux-gnu/cmake/pcl/PCLConfig.cmake:847 (find_external_library)
CMakeLists.txt:45 (find_package)

– Configuring incomplete, errors occurred!

cd /usr/lib/x86_64-linux-gnu

###2. 查看文件链接状态

ls -l libGL.so

显示为红色

大概就是文件链接到了不存在的文件身上，要做的就是重新建立链接。

###3. 查看相关文件

ls *GL*

sudo ln -s libGL.so.1 libGL.so

报错：

ln: 无法创建符号链接'libGL.so': 文件已存在

删除原项目

sudo rm /usr/lib/x86_64-linux-gnu/libGL.so

sudo ln /usr/lib/x86_64-linux-gnu/libGL.so.1   /usr/lib/x86_64-linux-gnu/libGL.so

ls -l libGL.so