root@ACS:/# apt install mongodb-10gen
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  fonts-lato libboost-filesystem1.58.0 libboost-program-options1.58.0 libboost-system1.58.0 libboost-thread1.58.0 libgoogle-perftools4 libjemalloc1 libpcrecpp0v5 libsnappy1v5
  libtcmalloc-minimal4 libunwind8 libv8-3.14.5 libyaml-cpp0.5v5 linux-image-4.2.0-42-generic linux-image-extra-4.2.0-42-generic rake ruby-did-you-mean ruby-minitest
  ruby-net-telnet ruby-power-assert ruby-test-unit unzip zip
Use 'sudo apt autoremove' to remove them.
The following NEW packages will be installed:
  mongodb-10gen
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 88.2 MB of archives.
After this operation, 226 MB of additional disk space will be used.
Get:1 http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist/10gen amd64 mongodb-10gen amd64 2.4.14 [88.2 MB]
Fetched 88.2 MB in 11s (7,742 kB/s)
Selecting previously unselected package mongodb-10gen.
(Reading database ... 113870 files and directories currently installed.)
Preparing to unpack .../mongodb-10gen_2.4.14_amd64.deb ...
Obsolete conffile /etc/init.d/mongodb has been modified by you, renaming to .dpkg-bak
Unpacking mongodb-10gen (2.4.14) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for ureadahead (0.100.0-19) ...
Processing triggers for systemd (229-4ubuntu19) ...
Setting up mongodb-10gen (2.4.14) ...
Installing new version of config file /etc/mongodb.conf ...
Installing new version of config file /etc/init/mongodb.conf ...
initctl: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused
insserv: warning: script 'K01mongodb' missing LSB tags and overrides
initctl: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused
initctl: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused
initctl: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused
initctl: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused
initctl: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused
initctl: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused
initctl: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused
insserv: warning: script 'mongodb' missing LSB tags and overrides
Processing triggers for ureadahead (0.100.0-19) ...
root@ACS:/# update-rc.d mongodb defaults
initctl: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused
The script you are attempting to invoke has been converted to an Upstart
job, but lsb-header is not supported for Upstart jobs.
insserv: warning: script 'mongodb' missing LSB tags and overrides
insserv: Default-Start undefined, assuming empty start runlevel(s) for script `mongodb'
insserv: Default-Stop  undefined, assuming empty stop  runlevel(s) for script `mongodb'
root@ACS:/# ps -ax | grep mongo
 2562 pts/0    S+     0:00 grep --color=auto mongo