My grandmother used Ubuntu for years. I setup autologin and put a Firefox shortcut on the Desktop. The next time a problem cropped up was when the LTS support ended
It's sold in grocery stores here too. Has the odor of an indoor swimming pool. We can sometimes fine "air chilled" chicken which is usually not chlorinated but is always more expensive.
/dev/urandom should stress the CPU more. /dev/random can be entropy limited