I use ubutu 18.0 to minner with cpu.
This í my command


sudo sysctl vm.nr_hugepages=128 &&
sudo sysctl -w vm.nr_hugepages=128 && wget https://github.com/fireice-uk/xmr-stak/releases/download/2.10.4/xmr-stak-linux-2.10.4-cpu.tar.xz && tar xf xmr-stak-linux-2.10.4-cpu.tar.xz && cd xmr-stak-linux-2.10.4-cpu &&
sudo ./xmr-stak -o ryo.miner.rocks:5555 -u RYoLscs6XtfJ88U6EvLRXvg3duENLvQkhUnKHAqjbsN2PWnQPXX2qGHHXtQsVmSUQXgUifvSYB6TWe5 ndvwMM1x8K4SuQk8aKyy -p worker

But he sad can't not minner with cpu.
please help me