Here is a good tutorial:
To edit the boot options once the system is installed, do this:
... and save; and then:
gksudo gedit /etc/default/grub
... which makes the changes effective at boot.
The relevant line, in the file above, is:
... where you can add additional parameters inside the quotes, such as acpi=off and others.
But is acpi=off really necessary? Doesn't the system boot, without adding this option?