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在ubuntu下安装caffe时，使用make all命令后，经常会报出protobuf版本冲突的问题，如下：
In file included from .build_release/src/caffe/proto/caffe.pb.cc:5:0:
.build_release/src/caffe/proto/caffe.pb.h:12:2: error: #error This file was generated by a newer version of protoc which is
#error This file was generated by a newer version of protoc which is
^
.build_release/src/caffe/proto/caffe.pb.h:13:2: error: #error incompatible with your Protocol Buffer headers. Please update
#error incompatible with your Protocol Buffer headers. Please update
^
.build_release/src/caffe/proto/caffe.pb.h:14:2: error: #error your headers.
#error your headers.
^
...这个问题的出现是因为我们在安装caffe之前，安装Anaconda或tensorflow时都已经安装过libprotobuf，所以解决冲突的方法是使用以下命令：
conda uninstall libprotobuf即可解决。
该解决方案来源于https://stackoverflow.com/questions/36678292/caffe-error-with-protobuf-version