Can you add the 'debug-ubiquity' boot parameter (without the quotes, obviously) to one of the systems that drops to a live environment, and attach /var/log/syslog and /var/log/installer/debug?
Can you add the 'debug-ubiquity' boot parameter (without the quotes, obviously) to one of the systems that drops to a live environment, and attach /var/log/syslog and /var/log/ installer/ debug?