Same here with the final release of 17.10 on macOS 10.13. Log out and
choose Ubuntu on Xorg and no more flickering. More discussion on
https://forums.virtualbox.org/viewtopic.php?f=8&t=85110.
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Public bug reported:
Trying Ubuntu 12.04 α2 in a VirtualBox guest (host is Ubuntu 11.04, all
64 bit). The mouse pointer does not show at all when the LiveCD starts.
I tried to install using keyboard and a busy pointer shows up at the
center of the screen, but still doesn't move when I wave my mous