1、用sudo pip3 install --upgrade pip,然后在重新下载一遍opencv-python

2、参照这篇文章

https://blog.csdn.net/qq_36427732/article/details/78461319?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522163882099516780274178287%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fall.%2522%257D&request_id=163882099516780274178287&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2allfirst_rank_ecpm_v1~rank_v31_ecpm-2-78461319.first_rank_v2_pc_rank_v29&utm_term=pip%E5%AE%89%E8%A3%85opencv%E6%97%B6%E5%8D%A1%E4%BD%8F%EF%BC%9ARunning+setup.py+install+for+opencv-python+&spm=1018.2226.3001.4187

以上是楼主用树莓派3B+装载Ubuntu18.04.02系统,装opencv-python时亲测有用的

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