I provided a password-file containing:

### BEGIN  01_user_list ###
set superusers='xxuser_namexx'
password_pbkdf2 xxuser_namexx grub.pbkdf2.sha512.3.DC0E03A0DB4....
### END 01_user_list ###

These file  "01_user_list"  will be added into the grub.cfg during "sudo
update-grub".

The file /boot/grub/grub.cfg contains two linux-kernel (see attachement)

->  the up_to_date 2.6.38-3 kernel

-> the backup-kernel 2.6.37-12

The later one ist put into the brackets and will be selected inside the
grub-menu via the sub-menu option!

Selecting the 2.6.38-3-kernel first, all will be working fine - asking
for user_name and passwort, if you try to use the keys "C" or "E"!!

Selecting the sub-menu first and after the previous kernel is shown, you
can select inside these sub-menu the keys "C" or "E" without any
authorization is nessassary, to use these two options - YOU CAN
MANIPULATE ALL!!!


** Attachment added: "part of grub.cfg"
   
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/718670/+attachment/1851925/+files/grub.cfg-part

** Tags removed: unity-2d

** Tags added: grub2

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https://bugs.launchpad.net/bugs/718670

Title:
  grub pbkdf2-function hints

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