protobuf canot install, have unmet dependencies

[help-bug]

system:Ubuntu 16.04.6 LTS \n \l
it happened like this：
    1. i need install caffe. and run 'sudo apt-get install libprotobuf-dev'
    2. and then 'caffe' install successful, and protoc --version is 2.6.1
    3. but i also need protoc(3.7.0)
    4. then i uninstall proto by "sudo apt-get remove libprotobuf-dev" and remove something
but is over!!!!!!
    when i run "sudo apt-get install libprotobuf-de" is show "the following packages have unmet dependcies : libprotobuf-dev : Depends: libprotobuf-lite9v5 (= 2.6.1-1.3) but 2.6.1-1.3ubuntu1 is to be installed
"
    i canot remove "libprotobuf-lite9v5" and also install "libprotobuf-dev". my proto is broken, and canot Automatic Repai. who can help me, pls