How to reproduce:
1. Start Unity
2. Select "Learn/Basic Tutorials"
3. Download one of the given tutorials and then start it
4. Wait until the editor starts

Expected result:
Tutorial should start

Actual result:
The tutorial does not start and three errors are present in the Console window.

Reproducible with:
2019.1.0a3, 2018.3.0b1, 2018.3.0a1

Not reproducible with:
2017.1.4p1, 2017.2.3p1, 2017.4.5f1, 2018.1.4f1, 2018.2.0b7

Notes:
1. The errors appear on other tutorial projects as well (e.g. Tanks project from Learn/Tutorial Projects).
2. The errors that are thrown are caused by "Assets/Content/game/PostProcessing/Editor/PropertyDrawers/MinDrawer.cs" file

Stack Trace:
Assets\Content\game\PostProcessing\Editor\PropertyDrawers\MinDrawer.cs(6,34): error CS0104: 'MinAttribute' is an ambiguous reference between 'UnityEngine.PostProcessing.MinAttribute' and 'UnityEngine.MinAttribute'