If u have installed GRUB,
at the OS boot selection menu type 'a' after selecting 'Linux'. Then type init 1. This will boot u into a shell with all priviledges. This is the single user mode. Now just change ur password. and reboot
If u have installed LILO,
type ctrl-x at the OS boot selection menu and type linux 1. This will also have the same effect as above.
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