Mongodb – How to install specific mongo version from the PPA

Once you've setup the offical mongo PPA, Mongo's docs say that to install a specific version on Ubuntu, to run something like:

sudo apt-get install -y mongodb-org=3.6.2

I'd like to install version 3.4.10 on Ubuntu 16. I verified this version is available with:

apt-cache policy mongodb-org

which lists:

mongodb-org:
  Installed: 3.4.10
  Candidate: 3.4.11
  Version table:
     3.4.11 500
        500 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4/multiverse amd64 Packages
     3.4.10 500
        500 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4/multiverse amd64 Packages
        100 /var/lib/dpkg/status
     3.4.9 500
        500 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4/multiverse amd64 Packages
     3.4.8 500
        500 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4/multiverse amd64 Packages
     3.4.7 500
        500 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4/multiverse amd64 Packages
     3.4.6 500
        500 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4/multiverse amd64 Packages
     3.4.5 500
        500 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4/multiverse amd64 Packages
     3.4.4 500
        500 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4/multiverse amd64 Packages
     3.4.3 500
        500 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4/multiverse amd64 Packages
     3.4.2 500
        500 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4/multiverse amd64 Packages
     3.4.1 500
        500 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4/multiverse amd64 Packages
     3.4.0 500
        500 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4/multiverse amd64 Packages

so I tried running:

sudo apt-get install -y mongodb-org=3.4.10

but I received this nonsensical output:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  mongodb-org-mongos mongodb-org-server mongodb-org-shell mongodb-org-tools
The following NEW packages will be installed:
  mongodb-org mongodb-org-mongos mongodb-org-server mongodb-org-shell mongodb-org-tools
0 upgraded, 5 newly installed, 0 to remove and 1 not upgraded.
Need to get 3,522 B/67.0 MB of archives.
After this operation, 271 MB of additional disk space will be used.
Get:1 https://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4/multiverse amd64 mongodb-org amd64 3.4.10 [3,522 B]
Fetched 3,522 B in 0s (8,901 B/s)       
Selecting previously unselected package mongodb-org-shell.
(Reading database ... 84310 files and directories currently installed.)
Preparing to unpack .../mongodb-org-shell_3.4.11_amd64.deb ...
Unpacking mongodb-org-shell (3.4.11) ...
Selecting previously unselected package mongodb-org-server.
Preparing to unpack .../mongodb-org-server_3.4.11_amd64.deb ...
Unpacking mongodb-org-server (3.4.11) ...
Selecting previously unselected package mongodb-org-mongos.
Preparing to unpack .../mongodb-org-mongos_3.4.11_amd64.deb ...
Unpacking mongodb-org-mongos (3.4.11) ...
Selecting previously unselected package mongodb-org-tools.
Preparing to unpack .../mongodb-org-tools_3.4.11_amd64.deb ...
Unpacking mongodb-org-tools (3.4.11) ...
Selecting previously unselected package mongodb-org.
Preparing to unpack .../mongodb-org_3.4.10_amd64.deb ...
Unpacking mongodb-org (3.4.10) ...
Processing triggers for man-db (2.7.5-1) ...
Setting up mongodb-org-shell (3.4.11) ...
Setting up mongodb-org-server (3.4.11) ...
Setting up mongodb-org-mongos (3.4.11) ...
Setting up mongodb-org-tools (3.4.11) ...
Setting up mongodb-org (3.4.10) ...

Why does it say it's installing 3.4.11…only to finally say it's setting up 3.4.10? When I run /usr/bin/mongod --version it indeed shows it's installed the wrong version.

db version v3.4.11
git version: 34f5bec2c9d827d71828fe858167f89a28b29a2a
OpenSSL version: OpenSSL 1.0.2g  1 Mar 2016
allocator: tcmalloc
modules: none
build environment:
    distmod: ubuntu1604
    distarch: x86_64
    target_arch: x86_64

What am I doing wrong?