linux - linux上的依赖和mongodb

Question

不太明白为什么在ubuntu下，每次尝试运行

ldd mongodb

（v3.0.7），我明白了：

   ./mongod: /lib/x86_64-linux-gnu/libssl.so.10: version `libssl.so.10' not found (required by ./mongod)
   ./mongod: /lib/x86_64-linux-gnu/libcrypto.so.10: version `libcrypto.so.10' not found (required by ./mongod)
        linux-vdso.so.1 =>  (0x00007ffeeb589000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f1d9175e000)
        libssl.so.10 => /lib/x86_64-linux-gnu/libssl.so.10 (0x00007f1d914ff000)
        libcrypto.so.10 => /lib/x86_64-linux-gnu/libcrypto.so.10 (0x00007f1d91124000)
...

ldd 找到了 libcrypto 和 libssl 但仍然显示错误告诉我...它找不到 libcryto 和 libssl ！？？