[solved] Re: after usermod can not su to root

[zhang zhengquan <zhang.zhengquan@gmail.com>]

>> pressing 'e' on the right GRUB entry, and adding 'single' to the end of the
>> line. This boots up Debian as root.
Thanks for the single user method,

I did usermod -l islanddancer zhengquan in single user mode. and was
able to su root again.

Thank you so much,

-- 
Zhengquan