我将mongodb repo添加到了源列表：
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，出现以下提示：
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 any available package
mongodb-org-tools : Depends: libssl1.0.0 (>= 1.0.1) which is a virtual package and is not provided by any available package
mongodb-org-shell : Depends: libssl1.0.0 (>= 1.0.1) which is a virtual package and is not provided by any available package
mongodb-org-server : Depends: libssl1.0.0 (>= 1.0.1) which is a virtual package and is not provided by any available package
The following actions will resolve these dependencies:
Keep the following packages at their current version:
1) mongodb-org [Not Installed]
2) mongodb-org-mongos [Not Installed]
3) mongodb-org-server [Not Installed]
4) mongodb-org-shell [Not Installed]
5) mongodb-org-tools [Not Installed]
Accept this solution? [Y/n/q/?]
但是aptitude search libssl给我：
root@ns:~# aptitude search libssl
p libssl-dev - Secure Sockets Layer toolkit - development files
p libssl-doc - Secure Sockets Layer toolkit - development documentation
p libssl-ocaml - OCaml bindings for OpenSSL (runtime)
v libssl-ocaml-4e458 -
p libssl-ocaml-dev - OCaml bindings for OpenSSL
v libssl-ocaml-dev-4e458 -
p libssl1.0-dev - Secure Sockets Layer toolkit - development files
i libssl1.0.2 - Secure Sockets Layer toolkit - shared libraries
i libssl1.1 - Secure Sockets Layer toolkit - shared libraries
所以我的问题是：如何在Debian 9上从某个受信任的存储库安装MongoDB 3.4？