That is totaly wrong.
Install a clean ubuntu virtual machine and follow the steps in tutorial, let me know the result.
If you come to any errors like I dont know oh in tutorial missing to restart ubuntu first or anything any any error dont fix them! just follow tutorial
That is just throwing words randomly and nod being able to do a copy paste.
For the Linux miner you just need a Ubuntu 18.04 updated and then just paste the steps in the tutorial.
I've installed today 9 terminals all by hand, manually (no scripting no automation besides the one included in the tutorial). So don't tell me it does not work.
I mined from POW 12417 WEBD just today with 800Kh/s.
You are exaggerating badly. As I said ,if there are some glitches that will eventually get fixed. It's not perfect but a work in progress as most blockchain systems.