14 votes

Why Virtual Box shows higher single core score than on the host CPU itself?

There is a long discussion about this on the Geekbench forum. From that discussion, it is pretty clear that you cannot expect to compare Windows and Linux scores against each other, though it is ...
  • 3,173
11 votes

How can I make my own account a sudoers on VirtualBox?

VirtualBox is TOTALLY relevant to the question. This can happen if you chose to have VirtualBox automatically create your first user for you when setting up Ubuntu. The first user is not added to ...
  • 111
7 votes

Cannot copy large VirtualBox image from local NTFS disk

The file in question might have a bad sector that is not normally used, so is only discovered when copying all the sectors. You may find information about the disk's status by consulting its SMART ...
  • 430k
6 votes
Accepted

I'm wondering how a virtual machine saves files on hardware

If helloworld.c is saved, it is saved at some point of allocated 30GB HDD. Then I should be able to find that directory of the file on windows. You can see the data on your Windows laptop, but not as ...
  • 400k
5 votes

mouse not working on virtualbox 6.1.34

For me, Ubuntu 22.04 under VirtualBox 6.1.34, helped uncheck box Nested Paging in VirtualBox Settings->System->Acceleration
  • 59
5 votes
Accepted

Win10 VM random crashes (VirtualBox, Debian11 host) - what else can I try?

Posting my comment as an answer. Similar problem was reported on VirtualBox forum, here is what discussion came to: The actual problem is that VirtualBox 6.1.34 and 6.1.97r150532 do not support ...
  • 216
4 votes

Accessing settings of an imported VM using VMWare throws "Could not get the dataFileKey" error

Had the same issue, Edit the VMX file for the VM, and set virtualHW.version = "20" to virtualHW.version = "19" For some reason when at version 20 , which is VMWare 17, it crashes
2 votes

Running Virtual Box VM inside VMWare VM (Windows Server 2008)

Virtual Box 6.0 Support for Nested Virtualization This release adds support for nested virtualization. This feature is only available on host systems that use an AMD CPU. Nested virtualization ...
  • 131
2 votes

Guest additionals: Kernel headers not found for target kernel

I was getting Issues even after getting the proper packages. I first made sure to check and update my kernel headers... yum update kernel kernel-headers ...made sure I had appropriate pre-reqs ...
2 votes

Truly delete all traces of a Vagrant machine

Vagrant creates an internal Virtual Machine related to a downloaded box. To delete all data from the Virtual Machine and Box I do recommend removing the box and also destroying the virtual machine. To ...
2 votes

Windows 10, running as VirtualBox guest, does not see USB flash drive

You are probably using the default USB version 1.1 instead of version 2.0 or 3.0. To enable USB support guest machine, you must first install The Extension Pack on the Host machine: Shutdown the VM ...
  • 430k
2 votes

how to change sector boundary?

The convertfromraw command in VirtualBox can't convert from VMDK files. As its name says, it only converts from "raw" image files (i.e. ones which aren't in any special format yet). (Sector ...
  • 400k
2 votes

Windows 10, running as VirtualBox guest, does not see USB flash drive

The Windows VM has to be Powered Off (Not Shutdown or Saved). The USB 2.0 & USB 3.0 & USB 2.0 radio buttons then appear in VirtualBox's menu Settings->USB. I selected USB 3.0 and then my ...
  • 139
2 votes
Accepted

Is VirtualBox 6.1 able to be installed correctly on Windows 11?

As it seems you've already installed the kernel headers via yum install kernel-devel. You probably need to update your system with yum update to fetch the current kernel header package.
  • 2,733
2 votes
Accepted

Virtualbox CPU limit lower than actual number of CPUs available on system

Why do I get the warning: 'You only have 8 CPUs' when in fact I have 16? You have 1 CPU that has 8 physical cores. Each of them is exposed as 2 logical cores due to HyperThreading. 8 × 2 = 16. ...
  • 54.7k
2 votes

Cannot copy large VirtualBox image from local NTFS disk

I'm a little confused on the partition formats on the source and destinations: NTFS (on Windows 7) supports a maximum file size of 16TB FAT16 supports a maximum file size of 4GB If you're trying to ...
  • 21
2 votes
Accepted

Cannot copy large VirtualBox image from local NTFS disk

Many thanks @all for the help and enthusiasm. Always enlighting to see how much help one can get here. Resolution of the story: After following advises to export the VM, the bad blocks theory got my ...
2 votes
Accepted

I'm Using disk2vhd and virtualbox. How do I disable Windows XP IDE checks so that it starts up without an IDE related BSOD?

For future reference, it looks like the MergeIDE utility is just a .reg and .bat file. For anyone who is unable to start the original machine, try downloading MergeIDE, extracting the files, and ...
2 votes

Why Virtual Box shows higher single core score than on the host CPU itself?

I would like to add that that Linux has some optimizations for virtualizing Linux. So if you run KVM/QEMU as a hypervisor there will be less overhead when virtualizing Linux as a host as opposed to ...
2 votes

which network mode should I use if want every machine to be connected

Bridge networking should be enough. Maybe some firewalls are the problem? Try resetting the vm network stack. Edit -> Virtual Network Editor -> Restore Defaults
  • 39
2 votes
Accepted

Oracle VM VirtualBox: Failed to open a session for the virtual machine

Disabling the secure boot from the BIOS setting worked.
2 votes

Is it possible to use a wifi network adapter in a Linux (guest) in a Virtual Machine in monitor mode?

I have the latest Workstation Pro and it still doesn't have a wireless NIC type, so direct wireless hardware access is out. For a network adapter of type USB, USB Passthrough requires Workstation Pro. ...
  • 430k
1 vote
Accepted

Expand Ubuntu drive on VirtualBox

Procedure I use after the virtual disk is resized. Does not require a reboot. In vSphere client, browse to the VM, edit settings, increase the size of the hard disk echo 1 > /sys/class/scsi_device/...
  • 616
1 vote
Accepted

Create a Stable Virtualized Windows OS on Ubuntu

You can do that with any virtualization solution. While virtualbox would work fine, I would recommend KVM/QEMU with virt-manager as frontend. QEMU/KVM installation Note that you need to enable ...
  • 2,733
1 vote
Accepted

How to connect USB DVD drive to VirtualBox on Linux

Download VirtualBox Extensions and be sure the version matches with your VirtualBox version. You can then install the VirtualBox Extensions with a command sudo vboxmanage extpack install --replace ~/...
  • 121
1 vote

How to get webcam working in VirtualBox

(This is a blind answer that goes by the documentation only.) First enter in Ubuntu the command v4l-info and see if the result is something like "Intel IPU3 CIO2". If this succeeds, it means ...
  • 430k
1 vote
Accepted

VirtualBox does not boot hybrid GPT/MBR, neither EFI nor MBR

Selecting an AHCI controller for the virtual disk originating from the physical USB was solved.
  • 21
1 vote

the capslock functionaliy is reversed in Ubuntu

This can be more complicated. I've seen your situation occasionally and it is frustrating. I never figured out how I got into it or really how I got out of it. This happened again today on VB 6.1.38 ...
  • 11
1 vote
Accepted

How can I allow the screen to auto-lock when virtualbox is focused?

This is a known issue with Gnome on Xorg. Xorg is no longer the default display server for recent versions of Ubuntu. If you switch to a Gnome Wayland session, screenlocking works as expected. It is ...
  • 162
1 vote

share file with VM which don't support guest additions

To copy files to the virtual machine use a virtual CD or DVD, and to copy files from (and also to) the virtual machine use a virtual floppy disk. Before reading the steps below read first how to add ...
  • 11

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