尝试安装openCV lib，其中一个步骤是安装cmake，但是当我
时sudo apt-get install cmake
我收到了
The following packages have unmet dependencies:
cmake : Depends: libjsoncpp0 but it is not installable
E: Unable to correct problems, you have held broken packages.
我安装了build-essential, libjsoncpp-dev, pkg-config...等
错误在哪里？