Erreur lors de l'installation d'Ubuntu

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bonjour, J'ai suivi le tuto de Nicky Win lors de l'installation à partir de Virtual Box d'ubuntu je regarde les logs VBox.log j'ai un message d'erreur et l'installation ne se fini pas.
Voici le message d'erreur :

00:00:09.385955 PIIX3 ATA: LUN#2: CD/DVD, total number of sectors 974848, passthrough unchanged
00:00:09.386312 Changing the VM state from 'LOADING' to 'SUSPENDED'
00:00:09.386475 Changing the VM state from 'SUSPENDED' to 'RESUMING'
00:00:09.387908 Changing the VM state from 'RESUMING' to 'RUNNING'
00:00:09.387964 Console: Machine state changed to 'Running'
00:00:09.526678 ERROR [COM]: aRC=VBOX_E_VM_ERROR (0x80bb0003) aIID={ab4164db-c13e-4dab-842d-61ee3f0c1e87} aComponent={DisplayWrap} aText={Could not take a screenshot (VERR_NOT_SUPPORTED)}, preserve=false aResultDetail=-37
00:00:09.529373 ERROR [COM]: aRC=VBOX_E_VM_ERROR (0x80bb0003) aIID={ab4164db-c13e-4dab-842d-61ee3f0c1e87} aComponent={DisplayWrap} aText={Could not take a screenshot (VERR_NOT_SUPPORTED)}, preserve=false aResultDetail=-37
00:00:09.752225 VUSB: Attached 'HidMouse' to port 1 on RootHub#0 (FullSpeed)
00:00:10.004606 GUI: UIMachineViewNormal::adjustGuestScreenSize: Adjust guest-screen size if necessary
00:00:10.009578 GUI: 2D video acceleration is disabled
00:00:10.009621 GUI: HID LEDs sync is enabled
00:00:10.018911 ERROR [COM]: aRC=VBOX_E_VM_ERROR (0x80bb0003) aIID={ab4164db-c13e-4dab-842d-61ee3f0c1e87} aComponent={DisplayWrap} aText={Could not take a screenshot (VERR_NOT_SUPPORTED)}, preserve=false aResultDetail=-37
00:00:10.028386 GUI: UIMachineLogicNormal::sltCheckForRequestedVisualStateType: Requested-state=0, Machine-state=5
00:00:11.017359 ERROR [COM]: aRC=VBOX_E_VM_ERROR (0x80bb0003) aIID={ab4164db-c13e-4dab-842d-61ee3f0c1e87} aComponent={DisplayWrap} aText={Could not take a screenshot (VERR_NOT_SUPPORTED)}, preserve=false aResultDetail=-37
00:00:12.013389 ERROR [COM]: aRC=VBOX_E_VM_ERROR (0x80bb0003) aIID={ab4164db-c13e-4dab-842d-61ee3f0c1e87} aComponent={DisplayWrap} aText={Could not take a screenshot (VERR_NOT_SUPPORTED)}, preserve=false aResultDetail=-37
00:00:13.016714 ERROR [COM]: aRC=VBOX_E_VM_ERROR (0x80bb0003) aIID={ab4164db-c13e-4dab-842d-61ee3f0c1e87} aComponent={DisplayWrap} aText={Could not take a screenshot (VERR_NOT_SUPPORTED)}, preserve=false aResultDetail=-37
00:00:14.010975 ERROR [COM]: aRC=VBOX_E_VM_ERROR (0x80bb0003) aIID={ab4164db-c13e-4dab-842d-61ee3f0c1e87} aComponent={DisplayWrap} aText={Could not take a screenshot (VERR_NOT_SUPPORTED)}, preserve=false aResultDetail=-37
00:00:15.011739 ERROR [COM]: aRC=VBOX_E_VM_ERROR (0x80bb0003) aIID={ab4164db-c13e-4dab-842d-61ee3f0c1e87} aComponent={DisplayWrap} aText={Could not take a screenshot (VERR_NOT_SUPPORTED)}, preserve=false aResultDetail=-37
00:00:16.016985 ERROR [COM]: aRC=VBOX_E_VM_ERROR (0x80bb0003) aIID={ab4164db-c13e-4dab-842d-61ee3f0c1e87} aComponent={DisplayWrap} aText={Could not take a screenshot (VERR_NOT_SUPPORTED)}, preserve=false aResultDetail=-37
00:00:17.013176 ERROR [COM]: aRC=VBOX_E_VM_ERROR (0x80bb0003) aIID={ab4164db-c13e-4dab-842d-61ee3f0c1e87} aComponent={DisplayWrap} aText={Could not take a screenshot (VERR_NOT_SUPPORTED)}, preserve=false aResultDetail=-37

entre temps j'ai arrêté et repris avec sauvegarde
quelqu'un saurait il pourquoi cette erreur?
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