Thanks @launchpad-startport at https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1736116/comments/50 and @isalexandru at https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1736116/comments/52.
Thanks @launchpad- startport at https:/ /bugs.launchpad .net/ubuntu/ +source/ virtualbox/ +bug/1736116/ comments/ 50 and @isalexandru at https:/ /bugs.launchpad .net/ubuntu/ +source/ virtualbox/ +bug/1736116/ comments/ 52.