Pierre: "what Sam said!"  Here is the Mint version (created with 18.2):

If problems, report back.  We still do not for sure whether to use vaapi or vdpau under which conditions -- GG says try 1 and if you get no results, try the other 😁😁 !  All feedback is welcome.  gg/Phyllis

Ugin:  there is a new Ubuntu18 build too so I hope you are reading this -- it does NOT have the Tracer plugin fix in it though.