Downloaded the latest AppImage and was modifying a sketcher constraint when the dialog popped up looking like this:
OS: Pop!_OS 18.10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.15671 (Git) AppImage
Build type: Release
Branch: master
Hash: 28cbe2bd8986701bb7404842cf60138957e23ed6
Python version: 3.6.7
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)