Using GRUB, you can manually edit the proposed menu entry at boot time. To do so, when GRUB is presenting the menu list (you might need to press ESC first), follow those instructions:
- use the arrows to select the boot entry you want to modify.
- press e to edit the entry
- use the arrows to go to kernel line
- press e to edit this entry
- at the end of the line add the word single
- press ESC to go back to the parent menu
- press b to boot this kernel
The kernel should be booting as usual (except for the graphical splash screen you might be used to), and you will finally get a root prompt (sh#).
As root, changing password does not ask for your old password, therefore running the command:
will prompt you for your new password and will ask you to confirm it to make sure there is no typo.
Edited by NickAu1, 16 April 2014 - 08:27 PM.