Mainly, letting it hang in console mode so you can see any output from the kernel.
Also, when it hangs, give it a few minutes to see if the kernel says anything, and also try some of the tips at: https://wiki.ubuntu.com/DebuggingSystemCrash -- after sleep+resume I can't restart the system https://launchpad.net/bugs/29695 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
