For help! Bosses, encountered the problem in running the gazebo times wrong, Ubuntu version for 18.0.4:
Gazebo: symbol lookup error:/usr/lib/x86_64 - - the gnu/Linux libgazebo_common. So. 9: undefined symbol: _ZN8ignition10fuel_tools12ClientConfig12SetUserAgentERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE