I installed Ubuntu 12.04 LTS using Wubi in the D: drive of my PC. I have Vista installed in the C: drive. I have forgotten my password for my Ubuntu Admin Account. I only have only access to the Guest login. Please note, I don't see any GRUB menu and get only Vista & Ubuntu as options while booting. I can't get into Recovery Mode of Ubuntu using Shift, ESC or any other way. Please let me know how to reset the password.