xubuntu@xubuntu:~$ sudo apt-get install smartmontools && sudo smartctl -a /dev/sdX
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  s-nail
Suggested packages:
  exim4 | mail-transport-agent gsmartcontrol smart-notifier
The following NEW packages will be installed:
  s-nail smartmontools
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 786 kB of archives.
After this operation, 2,202 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://archive.ubuntu.com/ubuntu xenial/universe i386 s-nail i386 14.8.6-1 [350 kB]
Get:2 http://archive.ubuntu.com/ubuntu xenial/main i386 smartmontools i386 6.4+svn4214-1 [436 kB]
Fetched 786 kB in 1s (699 kB/s)
Selecting previously unselected package s-nail.
(Reading database ... 172307 files and directories currently installed.)
Preparing to unpack .../s-nail_14.8.6-1_i386.deb ...
Unpacking s-nail (14.8.6-1) ...
Selecting previously unselected package smartmontools.
Preparing to unpack .../smartmontools_6.4+svn4214-1_i386.deb ...
Unpacking smartmontools (6.4+svn4214-1) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for systemd (229-4ubuntu19) ...
Processing triggers for ureadahead (0.100.0-19) ...
ureadahead will be reprofiled on next reboot
Setting up s-nail (14.8.6-1) ...
update-alternatives: using /usr/bin/s-nail to provide /usr/bin/mailx (mailx) in auto mode
Setting up smartmontools (6.4+svn4214-1) ...
Processing triggers for systemd (229-4ubuntu19) ...
Processing triggers for ureadahead (0.100.0-19) ...
smartctl 6.5 2016-01-24 r4214 [i686-linux-4.10.0-28-generic] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

Smartctl open device: /dev/sdX failed: No such device