I think it is not the problem of the memtest version 5.01. When I boot memtest 5.01 via USB-Stick it is working. No problems.
Only the integrated memtest 5.01 is making problems (started via grub, ubuntu 20.04) memtest 5.01 was also working in ubuntu 18.04 (via grub). Then I upgraded to 20.04 -> Freeze problem -- 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