Have you seen my latest answer to this question ->
askubuntu.com/questions/885422/… @terdon ? Do you have an idea why this gets only one upvote (from OP together with accept and a bounty today) although it was on the featured tab and I could help the user to solve his graphics problem ? Compared to the command line topic from @Serg and @Zanna above (both got more than 10 upvotes) it looks a bit poor, so I'm wondering. :)