I can confirm that the workaround in comment #3 https://bugs.launchpad.net/ubuntu/+source/virtualbox-ext-pack/+bug/1767402/comments/3 works...
I can confirm that the workaround in comment #3 https:/ /bugs.launchpad .net/ubuntu/ +source/ virtualbox- ext-pack/ +bug/1767402/ comments/ 3 works...