I just upgraded to Fusion 11 and my webcam is not working any more in guest Ubuntu 16.04 and 18.04. It basically gives one frame/sec at max. I tried with ffmpeg, guvcview and Unity3D, but no program can get more than that out of the built in webcam (Facetime).
Host is a MBP Late 2015. It worked flawlessly previously with Fusion 8-10.
PS: running on High Sierra 10.13.6 right now...
PPS: Linux guest was running kernels 4.4.0 and 4.15.x and it did not change anything on switching kernels...