PlayerInitEngineGraphics: GPU not supported; OpenGL 2.0 is required. (After cuda installation)

I want to run a Unity app on an ec2 instance with graphics. It is all working fine until I installed cuda. I do not want Unity to use cuda but I have another python program that needs cuda and that talks with Unity via socket. I am running the following command:

xvfb-run --auto-servernum --server-args='-screen 0 640x480x24:32' ./linux_build.x86_64 -force-opengl -logFile unity_app.log

The program crashes after showing the window briefly. The error is given below. I am using g2.2 ec2 instance type with ubuntu 14.04. I have less than a few weeks worth experience with Unity so I might have missed something. Any help will be appreciated.

......

XError: GLXBadRenderRequest (error 166, opcode 150/1, serial 147, XID 00000000, display 0x2b39a00\n XError: BadRequest (invalid request code or no such operation) (error 1, opcode 150/168, serial 148, XID 00000000, display 0x2b39a00

XError: GLXBadRenderRequest (error 166, opcode 150/1, serial 149, XID 00000000, display 0x2b39a00\n XError: BadRequest (invalid request code or no such operation) (error 1, opcode 150/169, serial 150, XID 00000000, display 0x2b39a00

XError: GLXBadRenderRequest (error 166, opcode 150/1, serial 151, XID 00000000, display 0x2b39a00\n XError: BadRequest (invalid request code or no such operation) (error 1, opcode 150/171, serial 152, XID 00000000, display 0x2b39a00

XError: BadRequest (invalid request code or no such operation) (error 1, opcode 150/171, serial 153, XID 00000000, display 0x2b39a00

PlayerInitEngineGraphics: GPU not supported; OpenGL 2.0 is required. Your GPU (AMD Radeon R9 M370X OpenGL Engine) or OpenGL drivers only supports OpenGL 1.4

Failed to initialize player\n