Unfortunately Intel's integrated GPUs don't fulfill the requirements for GPU rendering in Blender 2.8x. You would either need a:
Nvidia graphics card with CUDA compute capability 3.0 or higher
AMD graphics card from GCN second generation or later
CUDA requires graphics cards with compute capability 3.0 and higher. To make sure your GPU is ...
I was facing the same problem following this tutorial Model & Rig Pistons fast in Blender 2.8+. To select the edge loop it's said to use 'Shift alt click' but it doesn't work on my Mac.
I made somme research on the internet and I arrived here but it doesn't help me.
After some tries, I figured that With Blender 2.8 when you have enabled Emulate 3 ...