Android on virtualbox can't move mouse pointer
As it was mentioned in the comments above, there is reference for Android X86 – mouse support in Oracle VirtualBox linked in this answer. AFAIK I had not to install additional packages like vbox-guest-utillities. As you can see the following list is empty:

$ dpkg -l | grep virtualbox-guest
$ dpkg -l | grep vbox-guest


I only had to change the "Pointing Device" under Settings > System > Motherboard to "PS/2 Mouse".