while opening the bleachbit(as root) , gedbi and bootup- manager , it asks for the root password and on entering the password shows that the password is wrong ,

for other things like updating , installing the software from ubuntu software center the same password works well
due this problem i am not able to use boot up manager , gedbi, deepin-software-center and bleachbit (as root ) 
i am using ubuntu 13.04 with gnome shell and password length is of one letter