Using memtest86 with UEFI

[Sam Varshavchik]

I installed Ubuntu 20 on an UEFI system, and I want to run memtest86 to  
check its RAM, but it's missing from the grub menu.

I see the following in /etc/grub.d/20_memtest86+


# We need 16-bit boot, which isn't available on EFI.
if [ -d /sys/firmware/efi ]; then
  exit 0
fi

So, on UEFI memtest86 is not available. My question is: what are the  
alternatives?

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