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[ubuntu_mate] Downloaded 64-bit AMD deb file, but can't choose 64-bit OS

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I downloaded a 64-bit deb file to make sure I had the 64-bit version on this computer; I checked under Help in Virtualbox, but that window didn't report the architecture. Gdeb reported that the program was already installed. I ran commands to tell me if this particular AMD dual-core was Virtualization-capable; the output was to color "svm" if it was--I never received any output from the commands:
Code:

anthony@anthony-Aspire-X1200:~$ grep --color svm /proc/cpuinfo
anthony@anthony-Aspire-X1200:~$ egrep 'vmx|svm' /proc/cpuinfo
anthony@anthony-Aspire-X1200:~$ cat /proc/cpuinfo | grep "svm"

I read a post saying there were three things that needed to be met:

Quote:

I figured out what the problem was. VT-x in Virtualbox requires 3 things to work. First, you need a processor that is VT-x capable (check, just got a brand new one). Second, you need an OS that is VT-x capable (Ubuntu - check). Next, your motherboard needs to be able to recognize VT-x. My MOBO wasn't able to recognize the VT-x part of the new processor, but was still able to use the processor. A BIOS update fixed everything.
I checked BIOS and virtualization is supported. I'm trying to run Mint 18.2 Cinammon in Vbox and I have 16.04 Mate. Why does the Virtualbox only show 32-bit Linux when trying to create an OS in Vbox, and how do I get the program to use both cores? I have 4GB of memory. I'm using Virtualbox Version 5.1.28.

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