之前是因为将账号添加virtualbox的usb访问权限，导致账号出现如红色的错误
使用dvd ubuntu lucid 10.04.3进行急救
sudo passwd root修改root密码
然后再进入系统
su root
adduser paul admin
account@account-laptop:~$ sudo nvclock -S -80
[sudo] password for account:
account is not in the sudoers file. This incident will be reported.
account@account-laptop:~$ sudo adduser account admin
[sudo] password for account:
account is not in the sudoers file. This incident will be reported.
account@account-laptop:~$ sudo vi /etc/sudoers
[sudo] password for account:
account is not in the sudoers file. This incident will be reported.
account@account-laptop:~$ su root
Password:
root@account-laptop:/home/account# adduser account admin
Adding user `account' to group `admin' ...
Adding user account to group admin
Done.
root@account-laptop:/home/account# su account
account@account-laptop:~$ zhoubt
zhoubt: command not found
account@account-laptop:~$ su account
Password:
account@account-laptop:~$ sudo nvclock -S -1
[sudo] password for account:
Xlib: extension "NV-CONTROL" missing on display ":0.0".
Changing Smartdimmer level from 25% to 24%
New Smartdimmer level: 24%
account@account-laptop:~$ sudo nvclock -S -1
Xlib: extension "NV-CONTROL" missing on display ":0.0".
Changing Smartdimmer level from 24% to 23%
New Smartdimmer level: 23%
account@account-laptop:~$ sudo nvclock -S -1
Xlib: extension "NV-CONTROL" missing on display ":0.0".
Changing Smartdimmer level from 23% to 22%
New Smartdimmer level: 22%
account@account-laptop:~$