$ sudo apt-get install snmpd
<snip>
Reading package lists... Done
Building dependency tree
Reading state information... Done
<snip>
The following NEW packages will be installed:
  snmpd
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 76.1 kB of archives.
After this operation, 267 kB of additional disk space will be used.
Get:1 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main snmpd amd64 5.4.3~dfsg-2.4ubuntu1.1 [76.1 kB]
Fetched 76.1 kB in 1s (64.4 kB/s)
Preconfiguring packages ...
Selecting previously unselected package snmpd.
(Reading database ... 313214 files and directories currently installed.)
Unpacking snmpd (from .../snmpd_5.4.3~dfsg-2.4ubuntu1.1_amd64.deb) ...
Processing triggers for ureadahead ...
ureadahead will be reprofiled on next reboot
Processing triggers for man-db ...
Setting up snmpd (5.4.3~dfsg-2.4ubuntu1.1) ...
update-rc.d: warning: snmpd stop runlevel arguments (1) do not match LSB Default-Stop values (0 1 6)
 * Starting network management services:                                                                                 $ sudo netstat -plunt|grep snmpd
udp        0      0 127.0.0.1:161           0.0.0.0:*                           27854/snmpd
udp        0      0 0.0.0.0:39227           0.0.0.0:*                           27854/snmpd