Jupyter visualization doesn't plot figures on Ubuntu18.04 and Ubuntu16.04 server

**IMPORTANT: Please use the following template to report the bug.**
_____

**Describe the bug**
Jupyter visualization doesn't draw figures on Ubuntu18.04 and Ubuntu16.04 server. When I ran the following code, it didn't report any errors, but also plotted no figures. I tested on Ubuntu18.04 and Ubuntu16.04 server with open3d 0.7, 0.8 and 0.9, same problems. But it works well on my Macbook.
`
import numpy as np
import open3d as o3d
from open3d import JVisualizer

sub_cloud = np.random.random((100,3))
cloud_vis = o3d.geometry.PointCloud()
cloud_vis.points = o3d.utility.Vector3dVector(sub_cloud)

visualizer = JVisualizer()
visualizer.add_geometry(cloud_vis)
visualizer.show()
`

**Expected behavior**
I want find some ways to fix this problem, so I can work with Jupyter visualization on ubuntu systems.

**Screenshots**

**Environment (please complete the following information):**
I have tried it on Ubuntu systems with different python versions, open3d versions and installing methods, and met same problem:
- OS: Ubuntu 16.04 server , Ubuntu 18.04
- Python version: 3.5, 3.6
- Open3D version: 0.7, 0.8, 0.9
- Is this remote workstation?: yes, no
- How did you install Open3D?: pip and build_from_source ( GCC, CMake)