I've been trying to remaster the original live cd with tools like ubuntu builder and relinux but once I have the live image I am not able to connect to a network (Wired or wireless). The strange thing is that the network manager show a the connection but when you try to access the internet with firefox it won't connect to any site. I have disabled ufw and also try in the terminal ping to different sites and it just won't connect to them.

What can I do to see what is going on? Any help will be appreciate it.