Comment 11 for bug 164016

taken here:
https://wiki.ubuntu.com/DebuggingKernelBoot?highlight=(kernel)
To add other kernel boot option:
     1. Press 'Escape' key at the 3 second pause by Grub bootloader.

     2. Then press 'e' (edit) on the buggy kernel entry, followed by 'e'
        again on the kernel line.

     3. Then add nosmp and press 'b' to boot.

> bash: /sys/power/state: Permission denied
seems like sudo do not have permission to do this, so you should use "su
root"
to enable root account use "sudo passwd"