http://www.howtogeek.com/102009/how-to-password-protect-ubuntus-boot-loader/
here is an article to tell setup password protect on ubuntu,i want to do that way on debian the steps are as the following on ubuntu 1.*grub-mkpasswd-pbkdf* 2. sudo nano /etc/grub.d/40_custom set superusers=”name” password_pbkdf2 name [long string from earlier] 3.*sudo update-grub* 4.*sudo nano /etc/grub.d/ omitted 5.omitted in my debian ,i can't sudo update-grub *, there is no command update-grub in debian (my system is debian6+grub1.99) how can i do now? * *