remove libs:
[apt-get purge remove] or [aptitude purge]
how to use apt-get and aptitude
https://blog.csdn.net/yili_xie/article/details/4803314
some errors related to libs:
1.lack of libs
there is no use to install a required lib after installing opencv, because opencv cannot linked to it
2. libs confilct
the error below is mostly because of libs conflicts instead of lack of depending libs. remove all the conflicts libs and install again
3.spare libs
some libs are spare, remove them
common error: libs conflicts , usage of 'aptitude'
原文：https://www.cnblogs.com/zealousness/p/9495446.html