Update and workaround: I inserted manually into the grub.cfg between the lines:
submenu "Previous Linux versions" { menuentry 'Ubuntu, mit Linux 2.6.37-12-generic' --class ubuntu --class gnu-linux --class gnu --class os { submenu "Previous Linux versions" { set superusers='xxuser_namexx' password_pbkdf2 xxuser_namexx grub.pbkdf2.sha512.3.DC0E03A0DB4.... menuentry 'Ubuntu, mit Linux 2.6.37-12-generic' --class ubuntu --class gnu-linux --class gnu --class os { Now I will be asked to put in the user_name and the password, if I press the key "C" or "E" respectively. I hope it will help to find a final solution. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/718670 Title: grub pbkdf2-function hints -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs