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I have a Ubuntu desktop installed on Dell Optiplex 755. It's my regular desktop, and I installed Oracle VirtualBox from https://www.virtualbox.org/wiki/Linux_Downloads. The version selected was the "Ubuntu 13.04 ("Raring") / 13.10 ("Saucy") / 14.04 ("Trusty") / 14.10 ("Utopic")" AMD64 one.

And my OS is also 64 bit...:

uname -a
Linux mydd 3.16.0-29-generic #39-Ubuntu SMP Mon Dec 15 22:27:29 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

I believe my processor is 64-bit capable and my motherboard has enabled vt settings.... This is my processor information from the lscpu command:

Enter image description here

I believe I don't have VM products such as KVM, and I tried searching VM products using lsmod .. (just googled and found):

lsmod | grep vm
lsmod | grep kvm

Both are having blank results...

Yet, I can't find 64-bit version of guest VM settings...

Enter image description here

I tried installing/reinstalling .. yet not working.. Why can't I install a 64-bit guest vms on my PC? What should I chang to get the 64-bit OS working on my current PC/PS using VirtualBox? Any settings I should change?

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up vote 4 down vote

Enable Intel (R) Virtualization Technology and Intel (R) VT-d Feature in BIOS settings.

enter image description here

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If it solves your problem, click the grey ☑ under the "0" at the left of this text, which means "I accept the answer – Faizan Akram Dar Apr 11 '15 at 12:40
    
Both of them enabled yet i had to set Trusted Execution to Off .. Thanks for bios tip.. – user879 Apr 15 '15 at 5:25
up vote 4 down vote accepted

In the BIOS I had to change the following settings

Security > Execute Disable (set to On)
Performance > Virtualization (set to On)
Performance > VT for Direct I/O Access (set to On)
Performance > Trusted Execution (set to Off)

In my case first 3 i have already turned on, and what i had to turn off was Performance > Trusted Execution

Thanks to the article that pinpoited exact issue with bios on dell optiplex755 http://lifeofageekadmin.com/enable-virtualization-on-dell-optiplex-755-to-run-oracle-virtualbox-4/

Now everything is ok

enter image description here

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