# apt install  mongodb-org mongodb-org-server  mongodb-org-shell mongodb-org-tools 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:The following packages have unmet dependencies:
 mongodb-org : Depends: mongodb-org-mongos but it is not going to be installed
 mongodb-org-server : Depends: libssl1.0.0 (>= 1.0.1) but it is not installable
 mongodb-org-shell : Depends: libssl1.0.0 (>= 1.0.1) but it is not installable
 mongodb-org-tools : Depends: libssl1.0.0 (>= 1.0.1) but it is not installable
E: Unable to correct problems, you have held broken packages.

 

# apt-cache show mongodb-org-server
Package: mongodb-org-server
Source: mongodb-org
Version: 3.6.5
Architecture: amd64
Maintainer: Ernie Hershey <ernie.hershey@mongodb.com>
Installed-Size: 57883
Depends: libc6 (>= 2.18), libgcc1 (>= 1:4.1.1), libssl1.0.0 (>= 1.0.1), adduser, tzdata
 

# apt-cache search libssl
cl-plus-ssl - Common Lisp interface to OpenSSL
dcmtk - OFFIS DICOM toolkit command line utilities
libdcmtk-dev - OFFIS DICOM toolkit development libraries and headers
libdcmtk8 - OFFIS DICOM toolkit runtime libraries
libssl-ocaml - OCaml bindings for OpenSSL (runtime)
libssl-ocaml-dev - OCaml bindings for OpenSSL
libssl-dev - Secure Sockets Layer toolkit - development files
libssl-doc - Secure Sockets Layer toolkit - development documentation
libssl1.1 - Secure Sockets Layer toolkit - shared libraries
libssl1.0-dev - Secure Sockets Layer toolkit - development files
libssl1.0.2 - Secure Sockets Layer toolkit - shared libraries
perl-openssl-defaults - version compatibility baseline for Perl OpenSSL packages
r-cran-openssl - GNU R toolkit for encryption, signatures and certificates based on OpenSSL