Request for explanation of error message

[Rashkae]

On 2019-07-30 11:19 a.m., Bret Busby wrote:

> 
> Ah.
> 
> It is UEFI.
> 
> With that and it having MS Win10 preinstalled, that is why I installed
> UbuntuMATE 18.04 (now 18.04.2), rather than 16.04.

You can download the somewhat proprietary Memtest86 from here:

https://www.memtest86.com/

It's not open source, but it's no charge, very functional, and
development has outrun the open source version by an embarrassing margin.