Linux OS only flash image?

Host should be Ubuntu 18.04 or 20.04; 22.04 will fail. You might be able to get away with command line flash on a 16.04 host PC, and definitely can use command line flash via a 22.04 host PC, but you’ll save yourself a lot of effort if you have an 18.04 or 20.04 host PC. If you have time and don’t mind that it might fail, you could attempt command line flash from 16.04 (I wouldn’t recommend it though).