步骤：
sudo apt install flatpak
flatpak install flathub org.cloudcompare.CloudCompare
此时会有报错：
error: No remote refs found similar to ‘flathub’
执行
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
或者
flatpak remote-add --user --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
重新执行：
flatpak install flathub org.cloudcompare.CloudCompare
安装完毕：
打开该软件，直接将点云文件drag and drop到显示区即可（貌似从open里选择的话，无法找到点云文件）
参考：
- CloudCompare Download
- Getting this error when trying to use flatpak, “No remote refs found similar to ‘flathub’”
