我将 mongodb repo 添加到源列表：
deb http://repo.mongodb.org/apt/debian jessie/mongodb-org/3.4 main
然后 apt-get update。
当我尝试安装时，mongodb-org我得到了这个：
root@ns:~# aptitude install mongodb-org
The following NEW packages will be installed:
mongodb-org mongodb-org-mongos{ab} mongodb-org-server{ab} mongodb-org-shell{ab} mongodb-org-tools{ab}
0 packages upgraded, 5 newly installed, 0 to remove and 0 not upgraded.
Need to get 66.7 MB of archives. After unpacking 269 MB will be used.
The following packages have unmet dependencies:
mongodb-org-mongos : Depends: libssl1.0.0 (>= 1.0.1) which is a virtual package and is not provided by …