I have just installed Ubuntu 17.10 under VirtualBox on a MacbookPro OS 10.13.1. The screen blinks at random intervals. I repeated the installation twice, with a new .iso, and both failed the same way. Although 17.10 does several things better than 16.04.3, 16.04 does not blink. Is this a known bug in 17.10? Does anybody know how to fix it? Should I try 17.04?
I had this problem too with Ubuntu 17.10 on Mac OS High Sierra.
The solution listed here https://forums.virtualbox.org/viewtopic.php?f=8&t=85110 is to switch to XOrg mode, instead of Wayland.