To reproduce:
1. Open users attached project "PostProcessingStack.zip"
2. Build for iOS
3. Deploy the Xcode project to an iOS device

Expected results: grey cubes are visible
Actual results: getting only a dark screen and errors in Xcode console

Reproduced on:
2018.3.0f2 2018.3.3f1 2019.1.0a14 2019.2.0a2

Post Processing
2.0.5
2.0.7
2.0.10
2.1.0
2.1.2

Devices reproduced on:
-iPad Mini 2 (A7) iOS 12.1.3
-iPhone 6 (A8) iOS 10.3.3
-iPad Air 2 (A8X) iOS 11.0.3
-iPhone SE (A9) iOS 12.1.3
-iPad Pro 9.7 (A9X) iOS 11.2.5
-iPhone 7 Plus (A10) iOS 11.1.1
-iPhone 7 Plus (A10) iOS 12.0
-iPhone 7 (A10) iOS 12.1.3
-iPad Pro 10.5 (A10X) iOS 11.2.5

Devices not reproduced on:
-iPhone 8 (A11) iOS 12.1.3
-iPhone X (A11) iOS 12.1.3
-iPhone XS Max (A12) iOS 12.0
-iPhone 8 Plus (A11) iOS 11.0
-iMac MacOS 10.14

Notes:
-Reproduces on Metal
-On Post processing 2.0.3-preview and earlier getting errors in the console.
-Errors in the Xcode console:
WARNING: Shader Unsupported: 'Standard' - Pass 'META' has no vertex shader
WARNING: Shader Unsupported: 'Standard' - Pass 'META' has no vertex shader
WARNING: Shader Unsupported: 'Hidden/PostProcessing/Uber' - Pass '' has no vertex shader
WARNING: Shader Unsupported: 'Hidden/PostProcessing/Uber' - Pass '' has no vertex shader
Metal: Compute shader (AutoExposure.KAutoExposureAvgLuminance_fixed) has 128 threads in a threadgroup which is more than the supported max of 64 in this device
Metal: Compute shader (AutoExposure.KAutoExposureAvgLuminance_progressive) has 128 threads in a threadgroup which is more than the supported max of 64 in this device

-On GLES2 getting white cubes and this error in Xcode:
ERROR: Shader Shader is not supported on this GPU (none of subshaders/fallbacks are suitable)WARNING: Shader Unsupported: 'Hidden/PostProcessing/Debug/Vectorscope' - Setting to default shader.

-On GLES3 getting lots of error in Unity console after trying to build. Unable to build the project.