On first boot by an usb , before choosing keyboard layout, ChromeVox auto turns on, lagging the system, losing all control of the mouse, workaround that i used was quickly opening the control center and activating/desactivating, that will unlock your mouse, and you will can proceed installation.
(Sorry for the poor english, its not my native language)
Iām just reporting to help someone that may encounter this problem, and trying to report for developer, maybe looking for this small correction for the next versions, thank you! ;D
Hardware:
i3-3110m
HDD TOSHIBA 500gb
8GB RAM DDR3L
And other small things less importants to this report