whenever I try to install Xubuntu 18.10 within the newest version of Virtualbox by the isofile of Xubuntu the install process runs fine at first. After the necessary reboot I see a streaky display in Virtualbox and Virtualbox freezes. I have to do a hard reset of virtualbox then. Wiith Xubuntu 18.04.1 there are no problems in Virtualbox. So what about the reasons of this problem with 18.10? I would appreciate hints very much.