Install PCL under ubuntu18.04

  The overall steps can be referred to: https://blog.csdn.net/qq_42257666/article/details/124574029

  During my installation process, I encountered some problems, and I would like to explain a few points:

1. During the process of configuring VTK, the error is reported as follows:

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Solution :

sudo apt install libqt5x11extras5-dev

Reference: https://blog.csdn.net/danxibaoxxx/article/details/104251311

2. The display is incomplete during the cmake-gui configuration process, and there is no Module or VTK

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  This is because the following two options are not checked:
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Origin blog.csdn.net/gls_nuaa/article/details/131500943