I read it somewhere "If you are running virtual box on a 32 bit OS, you cannot install a 64 bit OS as a guest OS (in virtual box)." Is it true ?  If so, I want to know the reason ?   Note: I am using windows 7-32 bit, with intel dual core processor.
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Is is possible to run a 64 OS in a virtual environment host that is 32 bit. Say for example, I am running Windows XP 32 bit. Would it be possible for me to run a 64bit OS using VirtualBox or VMWare. My processor is a 64bit processor with VT enabled.
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I have Virtualbox 4.1.20 in Ubuntu 12.04 32 Bit (With PAE) and I want to run Ubuntu Server 64 Bit on the Guest. Is this possible?. I ask since I get the following warning:    I want to make sure that there is no option to "emulate" this. I have a 64 bit CPU that supports virtualization. The Intel DZ68DB motherboard with an Intel I7 2600 CPU.
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I've been running several VM's with VirtualBox, and the memory usage reported from various perspectives, and I'm having trouble figuring how much memory my VMs actually use.  Here is an example:   I have a VM running Windows 7 (as the Guest OS) on my windows XP Host machine. The Host Machine Has 3 GB of RAM The Guest VM is setup to have a base memory of 1 GB If I run Task Manger on the Guest OS, I see memory usage of 430 MB If I run Task Manger on the host OS, I see 3 processes that seem to belong to VirtualBox:   VirtualBox.exe (1), using 60 MB of memory (This one seems to have the most CPU usage) VirtualBox.exe (2), using 20 MB of memory VBoxSvc.exe, using 11.5 MB of memory  While running the VM, the Host OS's memory usage is about 2 GB When I shut down the VM, the Host OS's it goes back to memory usage goes down to about 900 MB   So clearly, there are some huge differences here.  I really don't understand how the GuestOS can use 400+ MB, while the Host OS only shows about 75 MB allocated to the VM.  Are there other processes used by VirtualBox that aren't as obviously named?  Also, I'd like to know if I run a machine with 1 GB, is that going to take 1 GB away from my host OS, or only the amount of memory the Guest machine is currently using?  Update:  Someone expressed distrust over my memory usage numbers, and I'm not sure if that distrust was directed at me, or my Host OS's Task Manager's reporting (which is perhaps the culprit), but for any skeptics, here is a screenshot of those processes on the host machine:
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Aka: How can I convert a .vdi or .vmdk to a real installation on a physical disk? Is it possible/feasible to migrate a Virtual Machine installation of Ubuntu onto a physical machine? If possible, how difficult would this be to accomplish and what steps would i need to take to prepare for the migration. I'd like to do some testing on a VM and if it works out migrate that system to physical hardware instead of reinstalling everything. Is this possible?
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I recently installed Oracle Virtualbox from their website on Xubuntu 15.04 64-bit. Specifically, Virtualbox 5.0.4. However, when I try to install a virtual machine, it only gives me the option to install a 32-bit OS (as seen below). Is there a way to allow 64-bit OSes?
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I have a Windows XP laptop, in which I run VirtualBox with the latest Ubuntu, my hardware is little old, so running the latest version of Ubuntu inside Virtual box is kind of a hassle, very slow performances, even if all i'm doing is running the terminal and practicing Linux commands !  I tried DSL (Damn Small Linux) with my VirtualBox, very small distro (50 MB), I am satisfied with how faster is my system now, but I miss Ubuntu, moreover, DSL is missing too many commands, such as sed an many others that I can't remember.  Is it possible to run Ubuntu just in console mode, no GUI or minimum GUI...no nice effects no fancy graphics? A link / tutorial would be much appreciated.
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When I start VirtualBox, I only have 32 bit operating systems available. After some research I followed the steps on  but to no avail. My host OS is 64 bit, Intel Virtualization Technology and VT-d are both enabled in the BIOS, and Hyper-V platform is disabled in the Windows Feature list, yet I still only am presented 32 bit operating systems.  I find these    and they seem to solve the problem for everyone, but not for me.   I also tried  the installation without luck. How can I fix this to run a 64 bit Linux OS in VB?  EDIT I also have the latest version of BIOS.  Edit: This question is not a duplicate of  as I state that the solution to that question did not solve this problem.
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I am using Ubuntu 12.04. I want to install Windows 7 on my system from a CD through VirtualBox. I searched the detailed tutorials through google but I did not find one that worked.   So can some one kindly share any detailed tutorial or link which will really help me out.
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I'm a completely new user of Linux and since my computer is not a good machine I wanted to install 32 bit OS, I downloaded ubuntu desktop for 32 bit but when I check in system settings under details it says my OS type is 64 bit, I downloaded it from the site  choose Ubuntu 12.04 LTS and set it as 32-bit (machines with less than 2GB RAM).
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I am planning to rent a VPS service with following basic specification:   512mb of RAM 1 CPU 20gb HDD (4gb of it is swap) Ubuntu 10.10 server   I am able to choose between a 32 bit or 64 bit install of Ubuntu server as the operating system.   My question is would it be better to chose a 32 bit operating system since I will have only 512mb of RAM, rather than using a 64 bit operating system and dealing with the additional overheads?  edit:  I have installed Ubuntu server 10.10 32 bit and 64 bit on VirtualBox. After a minimalistic installation with only ssh server, the 32 bit installation consumes 63mb of RAM when first boot up and 64 bit consumes 85mb of RAM.  After installing and running  daemon, 32 bit consumes 99mb of RAM when first boot up and 64 bit consumes 128mb.
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I have successfully installed VMWare Workstation 10 on my laptop running Windows 10. The virtualized system is CentOS.  Could install guest system and run it  I could successfully install the system and all, but after upgrading to Windows 10 Anniversary Update, I get this:    Removed Hyper-V  I have uninstalled everything from the system concerning Hyper-V. I removed it from my computer and restarted several times. No luck.
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I've installed VirtualBox using the Software Centre and I'm running a system on Ubuntu 14.04 with 8gb RAM, 64-bit dual core processor.  I want to run Windows 10, I've tried both 64 and 32 bit versions, in virtualbox. However, every time I start up windows 10 it gets to the point where the dots go round in a circle, then it freezes up and crashes back to the virtualbox manager. The only information it gives me is that the virtual machine was aborted.  I've changed the settings around a lot and nothing is working.  Any help would be appreciated.  Oh, and I've run Windows 10 technical preview on this machine before, a while ago  Thanks for any help in advance.
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What I do: I want to write a kernel module that does stuff to the KVM data structures. But I don't want to run it on the real machine, so I run one guest, inside it I run another two guests, and want to test my module.  The problem: VirtualBox (which now runs the outer guest), doesn't support nested virtualization, and when I cat /proc/cpuinfo | grep vmx I get no output.  What can I use that has nested virtualization?  You may look at my  to get an idea of what I want to do.
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I would like to set-up a PC to run ubuntu most of the time, but also need to run XP for specific applications and testing. In the past I would have simply set up a dual boot machine and then restart and boot into windows XP as needed.    However since the machine has multiple cores and significant memory, I think I can use Virtual Box, Xen, or VMWare hypervisors. I am thinking of making Ubuntu the "host" VM and having XP as a guest VM. This would be especially nice for testing/debug/development since it is possible to run applications in both OS's simultaneously. I've never setup a virtual machine before and think that by asking the questions below I can avoid some trial-and-error.  Basically, I need to decide if a dual boot or VM setup is more appropriate for what I want to do.  Here's my questions:   I do not always need to have XP running. Do the hypervisors allow me to shut the guest VM down so that the host VM can then immediately use all memory and processor resources? When I then bring up the guest VM, is it easy to provision how much memory and other resources are used by it? Ideally, I'd like to pre-configure this in advance and then toggle the guest VM off/on without thinking about it. Is it possible or advisable to have the host OS be 64bit and the guest OS be 32bit? Alternatively, if both VM's are 32 bit and I have 8G of RAM, can the hypervisor provision each VM with 4G of RAM when they are running simultaneously? Which hypervisors are best for set-ups such as I described?
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Is there an easy way to check if a binary is 32 or 64 bit on Windows? I need to check before I move the program to a 32bit machine and experience a spectacular failure.
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I have already dual systems : Windows 7 and Ubuntu installed on my laptop. The Windows 7 had been installed when I bought this laptop, and I don't have a CD.  I just installed VitrualBox under Ubuntu, hoping that I could install another Windows in this virtual machine, so that I could run some applications of Windows even under Ubuntu.  But it seems that I need a CD or ISO of Windows to boot inside this virtual machine. Otherwise, there is an error: FATAL: No bootable medium found! System halted. My question is where I could find a CD or ISO?  At the moment, I am downloading ISO from this , but do not know if it will work. By the way, I am not sure if I should pick the 32-bit or 64-bit? As my CPU is 64-bit but my Ubuntu is i386.  Could anyone help? Thank you very much.
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I know there are 32/64 bit OS in the market. Q1-> But what does this bit mean actually ? Q2-> What is the lowest bit OS and highest bit OS ?