Booting Ubuntu 13.10 Live CD to command line (recovery mode)

Ubuntu liveUSB(ubuntu-13.10-desktop-amd64.iso)
MSI GE70, i5-4200M, Nvidia GeForce GT 750M / 2GB GDDR5

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In GRUB menu on the item "Try Uuntu without installing",  type "e" to edit the boot commands. At the line start with "linux", replace the following:

quiet splash

with

ro recovery nomodeset

Then type "F10" to boot.

After it boot, screen black out. I thought it crashed again, but it's just in virtual terminal 7 without X initialized. I got command line after switching to other virtual terminals (Ctrl-Alt-F1 to F6)

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Kernel Command Line Parameters
http://distro.ibiblio.org/fatdog/web/faqs/boot-options.html

grub2 - How to boot to the recovery mode if it is not listed in Grub? - Ask Ubuntu
http://askubuntu.com/questions/326528/how-to-boot-to-the-recovery-mode-if-it-is-not-listed-in-grub

10 boot time parameters you should know about the Linux kernel - nixCraft
http://www.cyberciti.biz/tips/10-boot-time-parameters-you-should-know-about-the-linux-kernel.html

Ubuntu 14.04 (Trusty Tahr) Daily Build
http://cdimage.ubuntu.com/daily-live/current/