Android-x86 6.0 Marshmallow in VirtualBox doesn't start

This worked for me.

  1. At the Grub screen, press e.
  2. Press e again. Add vga=788 (need a leading space).
  3. Press b to boot.

To make this permanent, at the Grub screen, select the second choice. Then follow these steps.

  1. cd /mnt/grub
  2. vi menu.lst
  3. On the 7th line which starts with kernel, press a and then type vga=788 (need a leading space).
  4. Press Esc, then :wq to save the file and quit.
  5. Press the right Ctrl key, select Machine > Reset and then click "Reset".

The error will still appear, but now it will continue on.