fatal: Could not parse object '92a55a4a40766f1d82d179571c6f8b121e0a83a6'. From https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim * branch master -> FETCH_HEAD HEAD is now at 92a55a4 Known errors with Ubuntu 18.04, Debian stretch, and g++ 7. Instructions for quick fix. 92a55a4a40766f1d82d179571c6f8b121e0a83a6