The LightdmDisplayLog.txt looks suspicious:
pci id for fd 14: 80ee:beef, driver (null) EGL_MESA_drm_image required.
Does the problem still occur in the final/latest release of 18.04?
http://releases.ubuntu.com/18.04/
The LightdmDisplayL og.txt looks suspicious:
pci id for fd 14: 80ee:beef, driver (null) drm_image required.
EGL_MESA_
Does the problem still occur in the final/latest release of 18.04?
http:// releases. ubuntu. com/18. 04/