PC System OS Linux/Ubuntu Recover/Reset Root Forgetten Password

To Enter BIOS/Setup #

vmware #

reboot Ctrl Alt Insert setup F2 boot menu ESC

Linux/Nix OS #

[Reset Root Password, Forget Password, Reset Password]

Shift while booting (Esc for v9 earlier version);

Highlight the normal booting item (which is highlighted by default);

’e’ to edit;

Find the line starts with linux ....;

Delete … quiet splash $vt_handoff …,

Change ro (read only) to rw, and add init=/bin/bash to the end of the line;

Ctrl+x or F10 to boot using this modified temporary item;

Root shell will be available, passwd to modify and then reboot.

WARN tip: Desktop version may prevent root to login even if the password is correct, so a sudo-abled non-root user is a good choice to login.

ref:

https://help.ubuntu.com/community/LostPassword  The Other Way