I have the same issue on Ubuntu 20.04 LTS. There is some issue with the memtest86 binary in Ubuntu. Here is how to fix it:
1. Get rid of Ubuntu version of memtest sudo apt remove memtest86+ 2. Download the official memtest86 5.01 binary from here : https://www.memtest.org/download/5.01/memtest86+-5.01.bin.gz 3. Extract from the archive and copy memtest86+-5.01.bin to /boot sudo cp memtest86+-5.01.bin /boot/memtest86+.bin 4. Update grub sudo update-grub -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1876157 Title: Memtest86+ in Ubuntu 20.04 doesn't work, switch to Coreboot branch or package new release v5.31b is available since 12/04/2020 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/memtest86+/+bug/1876157/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
