Where is MemTest86 software?

Hi!

So I have recently installed Lubuntu 20.04 and noticed there is no MemTest86 software in the GRUB menu?

Thanks!

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Known problem across the landscape of Ubuntu images, actually:

tl;dr it doesn’t work in UEFI. Use BIOS/legacy boot.

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Thanks @wxl

I see the memtest appear regularly on some boxes, but not on others, and hadn’t cared enough to work out why (BIOS or uEFI setup). Thank you.

Actually, I had totally forgotten about it until @apt-ghetto reminded me so you can thank them :wink:

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Had no idea about this one! Very interesting! Thanks for the info. :wink:

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Please notice that there are two versions of memtest, one FOSS that works only in BIOS mode and one free as in free beer, that works also in UEFI mode. This link may help explaining the details.

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@sudodus have you tried out the new version of memtest86+ that was just released? I wonder if EFI support isn’t somehow a new feature though I don’t see it in the changelog and the likelihood is small.

If I understand and remember correctly from https://www.memtest.org/, the bleeding edge version is memtest86+ v5.31b, which is a beta version. Last September I downloaded and tested it, and it worked in BIOS mode but did not work in UEFI mode.

If you have found another new[er] version, please tell us about it and add a link :stuck_out_tongue:

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Nope, that’s the one. :frowning:

Thanks!

But please, could you explain what is the difference between UEFI and Legacy?

I am currently using a pre-built and had to disable CSM in order to be able to install Lubuntu. The problem is when I enable CSM again in order to be able to change from UEFI to Legacy Mode, the computer won’t boot and GRUB won’t load up.

This is a Lenovo mini-pc model M75q-1.

CSM should be an aspect of the UEFI implementation that allows for the legacy boot. Regardless of whether or not you use UEFI or legacy (BIOS), the installer should boot without issues. Now if you have an install that’s based on a UEFI boot, you’re not going to have a good time booting to it with legacy and vice versa.

More info here:

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