ubuntu下,opencv3.x安装一直downloading这个包,要看超时信息里的下载路径,把它放到下载路径中,比如我的opencv3.2.0源文件路径为/home/han/software/linux_opencv/opencv-3.2.0/,要把protobuf这个tar.gz包放在/home/han/software/linux_opencv/opencv-3.2.0/opencv_contrib/modules/dnn/.download/bd5e3eed635a8d32e2b99658633815ef/v3.1.0下才行,bd一长串是这个文件的md5值,不用改.没有contrib文件夹的去github上搜opencv-contrib下载后解压到opencv-3.2.0文件夹中即可
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