It is possible on Linux and probably preferred. You definitely want to use a mid to high end video card or it won't be profitable. For Ethereum, I would suggest the AMD RX series (470, 480, 570, 580). The lower end 470 cards will get you around 20 MH/s and use around 100-150w of power, so you can figure your profit ratio using those here -> https://www.coinwarz.com/calculators/ethereum-mining-calculator