Install Memtest86+ by running: # memtest-setup If you use GRUB 2 (the default) it will install 20_memtest86+ GRUB template into /etc/grub.d and you will also need to regenerate GRUB 2 config by running: # grub2-mkconfig -o /boot/grub2/grub.cfg This is not done automatically because it could overwrite any custom changes in /boot/grub2/grub.cfg.