Thanks for pointing out the location. I opened the file just after the error but it did no contain anything interresting:
VirtualBox XPCOM Server 5.0.12 r104815 linux.amd64 (Dec 18 2015 17:08:04) release log 00:00:00.003705 main Log opened 2016-04-23T12:37:03.945428000Z 00:00:00.003707 main Build Type: release 00:00:00.003710 main OS Product: Linux 00:00:00.003710 main OS Release: 3.16.0-30-generic 00:00:00.003711 main OS Version: #40~14.04.1-Ubuntu SMP Thu Jan 15 17:43:14 UTC 2015 00:00:00.003739 main DMI Product Name: Z9PE-D16 Series 00:00:00.003746 main DMI Product Version: 1.0X 00:00:00.003823 main Host RAM: 15995MB total, 15708MB available 00:00:00.003826 main Executable: /usr/lib/virtualbox/VBoxSVC 00:00:00.003827 main Process ID: 2428 00:00:00.003827 main Package type: LINUX_64BITS_UBUNTU_14_04 00:00:00.110860 nspr-2 Home directory: '/root/.config/VirtualBox' 00:00:00.111175 nspr-2 Loading settings file "/root/.config/VirtualBox/VirtualBox.xml" with version "1.12-linux" 00:00:00.117237 nspr-2 Successfully initialised host USB using sysfs 00:00:00.124953 nspr-2 HostDnsMonitor: old information 00:00:00.124964 nspr-2 no server entries 00:00:00.124969 nspr-2 no search string entries 00:00:00.124971 nspr-2 no domain set 00:00:00.124973 nspr-2 HostDnsMonitor: new information 00:00:00.124975 nspr-2 server 1: 192.168.1.1 00:00:00.124978 nspr-2 no search string entries 00:00:00.124980 nspr-2 no domain set 00:00:00.124984 nspr-2 HostDnsMonitorProxy::notify 00:00:00.130331 nspr-2 VD: VDInit finished 00:00:00.140840 nspr-2 Loading settings file "/root/VirtualBox VMs/Windows 7 XPDM/Windows 7 XPDM.vbox" with version "1.12-linux" 00:00:00.143291 nspr-2 Loading settings file "/root/VirtualBox VMs/Xubuntu/Xubuntu.vbox" with version "1.14-linux" 00:00:05.154728 main ERROR [COM]: aRC=VBOX_E_OBJECT_IN_USE (0x80bb000c) aIID={4afe423b-43e0-e9d0-82e8-ceb307940dda} aComponent={MediumWrap} aText={Medium '/root/VirtualBox VMs/Windows 7 XPDM/Windows 7 XPDM-disk2.vmdk' cannot be closed because it is still attached to 1 virtual machines}, preserve=false aResultDetail=0 00:00:05.154850 main ERROR [COM]: aRC=VBOX_E_OBJECT_IN_USE (0x80bb000c) aIID={4afe423b-43e0-e9d0-82e8-ceb307940dda} aComponent={MediumWrap} aText={Medium '/tmp/DisplayWall/Build/Linux/Debug/Xubuntu.vdi' cannot be closed because it is still attached to 1 virtual machines}, preserve=false aResultDetail=0 00:00:05.644170 Watcher ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={0169423f-46b4-cde9-91af-1e9d5b6cd945} aComponent={VirtualBoxWrap} aText={The object is not ready}, preserve=false aResultDetail=0 00:00:10.159690 main {00007f97f0015160} HostPowerServiceLinux::~HostPowerServiceLinux: RTThreadWait() for 5000 ms failed with VERR_TIMEOUT My error occurs on 15:37:04 so the trailing errors should not be the cause, will investigate further but thanks for the help. [23.04.2016 15:37:03.894] === Start (PID: 2417) === [23.04.2016 15:37:04.099] ../../../Sources/VirtualBoxSource/VirtualBoxSource.cpp(31): failed to create VirtualBox API instance(0x80004005) [23.04.2016 15:37:04.102] === Stop ===
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