title: error: unable to connect to system d-bus : d-bus not installed
body: <p>I am now using Virtual Box to start VM, and the Version is 5.1.26 r117224 (Qt5.6.2), But when I trying to start the VM, I saw the error msg below:</p>
  
  <pre><code>00:00:29.246866 VMMDev: Guest Log: 00:00:00.000071 main     Log opened 2017-09-06T09:15:08.889100000Z
  00:00:29.248469 VMMDev: Guest Log: 00:00:00.001614 main     OS Product:Linux
  00:00:29.248506 VMMDev: Guest Log: 00:00:00.001654 main     OS Release: 4.4.84-boot2docker
  00:00:29.248534 VMMDev: Guest Log: 00:00:00.001684 main     OS Version: #1 SMP Tue Aug 29 23:44:06 UTC 2017
  00:00:29.248561 VMMDev: Guest Log: 00:00:00.001710 main     Executable: /sbin/VBoxService
  00:00:29.248568 VMMDev: Guest Log: 00:00:00.001711 main     Process ID: 1371
  00:00:29.248572 VMMDev: Guest Log: 00:00:00.001712 main     Package type: LINUX_64BITS_GENERIC
  00:00:29.252522 VMMDev: Guest Log: 00:00:00.005712 main     5.1.26 r117224 started. Verbose level = 0
  00:00:29.256154 VMMDev: Guest Log: 00:00:00.009377 vminfo   rtldrNativeLoad: dlopen('libdbus-1.so.3', RTLD_NOW | RTLD_LOCAL) failed: libdbus-1.so.3: cannot open shared object file: No such file or directory
  00:00:29.256200 VMMDev: Guest Log: 00:00:00.009429 vminfo   Error: Unable to connect to system D-Bus (1/3): D-Bus not installed
  00:00:29.260498 VMMDev: Guest Additions capability report: (0x0 -&gt; 0x0) seamless: no, hostWindowMapping: no, graphics: no
  00:00:29.274142 NAT: IPv6 not supported
  00:00:31.212453 NAT: DHCP offered IP address 10.0.2.15
  00:00:31.212606 NAT: DHCP offered IP address 10.0.2.15
  00:00:34.254495 VMMDev: Guest Log: 00:00:05.010198 vminfo   Error: Unable to connect to system D-Bus (2/3): D-Bus not installed
  00:00:39.253672 VMMDev: Guest Log: 00:00:10.011849 vminfo   Error: Unable to connect to system D-Bus (3/3): D-Bus not installed
  </code></pre>
  
  <p>Anyone can help solve the problem? Thanks.</p>