I'm running QGIS 3.4 Madeira on Linux Mint 17. The upgrade to 3.4 seemed to go smoothly, but there is no "3D View" option in my "View" menu.
Is there something else I need to do? FWIW QGIS 3 J's works OK.
As touched on in the comments above, your distro has a very outdated version of the Qt libraries where required 3D functionality is not available. You need to update your distro to remedy this.