I know this doesn't help, but it's running (almost) fine for me. I installed Ubuntu 16.10 on Virtual Box Version 5.1.6 r110634, with Windows 10 64 bit host. The only problem I have is that the desktop background doesn't resize when I resize the VBox window.
[edit] I used the default settings suggested by VBox except I increased the RAM to 2GB, the disk to 12GB, and selected virtio-net for networking. I used a downloaded ISO (ubuntu-16.10-desktop-amd64.iso) to install.
What system/settings are you using?
[edit] I used the default settings suggested by VBox except I increased the RAM to 2GB, the disk to 12GB, and selected virtio-net for networking. I used a downloaded ISO (ubuntu-16.10-desktop-amd64.iso) to install.
What system/settings are you using?