VirtualBox Ubuntu error: AMD-V is disabled in the BIOS

[^rooker]

[PROBLEM]
Trying to start VirtualBox client VM on Ubuntu server 14.04.3 (64bit LTS), throws the following error message:

VBoxHeadless --startvm "My first VM"
Oracle VM VirtualBox Headless Interface 4.3.10_Ubuntu
(C) 2008-2015 Oracle Corporation
All rights reserved.

29/10/2015 21:42:37 Listening for VNC connections on TCP port 3389
29/10/2015 21:42:37 Listening for VNC connections on TCP6 port 5900
VRDE server is listening on port 3389.
Error: failed to start machine. Error message: AMD-V is disabled in the BIOS (or by the host OS). (VERR_SVM_DISABLED)

[SOLUTION]
Enable the hardware virtualization in the BIOS:

Secure Virtualization Manager: Enabled