My Trisquel 5.5 install hung recently.
Installing on a Lenovo G475 laptop with the standard 700mb Gnome CD, the
live-cd would boot fine. When double clicking on the desktop icon to install
Trisquel, the laptop would hang completely. No response to anything but
holding the power button.
The workaround for this was to download the NetInstall 25mb iso and install
from that in text mode.
This laptop freeze sounds like a different issue to your hang, but may be of
use to the devs or others trying to install on similar hardware.
