Login Into Single User Mode Linux

LILO >>>

ok, i found the easiest way to change a root passwd on a physically
accessed machine is to apply the boot params "init=/bin/bash rw"
 
ie if you use lilo, and your image is "linux" try

press "esc" when lilo prompt comes out, and press "tab" 

linux init=/bin/bash rw

this should drop you to a root shell.

use passwd to change the root password and enter your new password.

and run "sync" before you reboot.

finally use ctlr+alt+del for reboot

GRUB >>>

if you use grub, try

(1) At grub boot screen (after restart)

(2) Select the kernel

(3) Press the e key to edit the entry

(4) Select second line (the line starting with the word kernel)

(5) Press the e key to edit kernel entry so that you can append single user mode

(6) Append the letter S (or word Single) to the end of the (kernel) line

(7) Press ENTER key

(8) Now press the b key to boot the Linux kernel into single user mode

(9) When prompted give root password and you be allowed to login into single user mode.