With the following hardware:
Settings > Details > About
Processor Intel Core i7-7700HQ CPU Graphics GeForce GTX 1070 with MaxQ Design/PCIe/SSE2 GNOME 3.28.2 OS type 64 bit
Software & Updates > Additional Drivers
NVIDIA Corporation: GP104M [GeForce GTX 1070 Mobile] (GeForce GTX 1070 Max-Q) [x] Using NVIDIA driver metapackage from nvidia-driver-415 (open-source) [ ] Using NVIDIA driver metapackage from nvidia-driver-396 (open-source) [ ] Using NVIDIA driver metapackage from nvidia-driver-410 (open-source) [ ] Using X. Org X server - Nouveau display driver from xserver-xorg-video-nouveau (open source)
I plugged in, via thunderbolt 3, an eGPU and booted my device. However the eGPU is not detected.
this didn't help me any...