Hi
I know there are most likely more important issues to solve but the graphic problem in a virtual machine is not beneficial to getting people to try Lubuntu.
I noticed this problem back with 16.04 and although a simple work around exists the problem has not been solved. Xubuntu (16.04) did not have this problem.
The work around I have used is to allow the "Try Lubuntu with out Installing" to boot up to the X window screen (total graphic garbage).
Then type <Ctrl><Alt><T> to start a terminal window Then typing blind
sudo service lightdm restart
Oracle VirtualBox 5.2.4
Also Bionic_desktop_i386.iso says 17.10 and not 18.04
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