I have recently installed a VM and Ubuntu, once I finished installing Ybuntu I had the following message
drm:vmn_host_log [vmugfx] ERROR Failed to send log
I´m no programmer and my knowledge is honestly very limited on this, does anyone know how can I solve this?
Go to settings in the VirtualBox.
Then go to Display.
Then change the Graphic controller to VBOX VGA.
Ubuntu will start working.
I ran across this issue as well, but I believe that I found a solution! Here are my configurations that fixed this issue.
That should be everything, I believe that your system just didn't have enough RAM to allocate the graphics display for the VM. The error might pop up again, but it should load to the Ubuntu home screen. Here is a link to a PDF that proved incredibly useful for this installation process: http://www.cs.fsu.edu/~carnahan/cis4930sp17/SettingUp.pdf
This answer is coming very late, but hopefully it will help someone. To solve this issue you need to unmount the optical drive containing the live image. This is also the case if you are trying to install the Virtualbox Guest Additions and have mounted the live CD.