When trying to install the current Ubuntu 18.10 (beta) desktop image (.iso) in VirtualBox (v5.2.18 r124319 for MacOS 10.13.6), I get the perennial problem of a blank screen hang after the initial splash screen. No error messages at all, just a hang. I've had this same problem with the daily 18.10 betas and was hoping that maybe it would resolve itself if I waited for the first official beta, but it hasn't.
With past Ubuntu VMs I think I've gotten past this by increasing memory for the VM, but going to 2048 MB and beyond isn't helping this time. Nor has increasing video memory or toggling 3D acceleration or the paravirtualization interface (as discussed in this thread).
Any suggestions for getting past this would be much appreciated!