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Unable to install .iso's in virtualbox, but why?




I'm having great difficulty in getting virtualbox running. every time
that I try to install an iso it fails and shows this in a pop-up -

--8<---------------cut here---------------start------------->8---
Failed to open a session for the virtual machine Debian-64.

VT-x is disabled in the BIOS for all CPU modes (VERR_VMX_MSR_ALL_VMX_DISABLED).

Result Code: NS_ERROR_FAILURE (0x80004005) Component: ConsoleWrap Interface: IConsole
{872da645-4a9b-1727-bee2-5585105b9eed}
--8<---------------cut here---------------end--------------->8---

I've had a look at the bios setup and I can't see anywhere that mentions 'vt-x'.

According to dmidecode this is my bios -

--8<---------------cut here---------------start------------->8---
Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
	Vendor: American Megatrends Inc.
	Version: 0701
	Release Date: 02/28/2017
	Address: 0xF0000
	Runtime Size: 64 kB
	ROM Size: 16384 kB
	Characteristics:
		PCI is supported
		APM is supported
		BIOS is upgradeable
		BIOS shadowing is allowed
		Boot from CD is supported
		Selectable boot is supported
		BIOS ROM is socketed
		EDD is supported
		5.25"/1.2 MB floppy services are supported (int 13h)
		3.5"/720 kB floppy services are supported (int 13h)
		3.5"/2.88 MB floppy services are supported (int 13h)
		Print screen service is supported (int 5h)
		8042 keyboard services are supported (int 9h)
		Serial services are supported (int 14h)
		Printer services are supported (int 17h)
		ACPI is supported
		USB legacy is supported
		BIOS boot specification is supported
		Targeted content distribution is supported
		UEFI is supported
	BIOS Revision: 5.12
--8<---------------cut here---------------end--------------->8---

And this is my motherboard -

--8<---------------cut here---------------start------------->8---
Handle 0x0002, DMI type 2, 15 bytes
Base Board Information
	Manufacturer: ASUSTeK COMPUTER INC.
	Product Name: PRIME Z270-P
	Version: Rev X.0x
	Serial Number: 170398734002919
	Asset Tag: Default string
	Features:
		Board is a hosting board
		Board is replaceable
	Location In Chassis: Default string
	Chassis Handle: 0x0003
	Type: Motherboard
	Contained Object Handles: 0
--8<---------------cut here---------------end--------------->8---

How can I enable 'VT-x' then please so that I can run successfully
virtual machines on this box please?

Thanks
Sharon.
-- 
A taste of linux = http://www.sharons.org.uk
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