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/ ** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu) ** Changed in: xorg-server (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1757493 Title: Login loop using virtualbox with 3D acceleration To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1757493/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp