GrblGru @Linux ?
I have been asked many times if GrblGru is also available for Linux. Until now I always had to deny this.
But now a clever user has found a way to run GrblGru on “Wine” under Linux.
According to him it is still possible to improve the process.
Since I have no experience with Linux, I can only pass on the instruction on my website at the moment. (See https://www.grblgru.com/)
I would be very happy if the Linux gurus of this forum would take a look at it. 
Necessary information and also changes for further improvements I will gladly provide.
Have fun with GrblGru