Hi,
U can reset boot menu password through removing BIOS battery and than switch on the system it will clear or some boards are with jumpers u can check CMOS clear from 1 to 2 for clear 2 to 3.try it.
Click "Applications" and then click "Accessories" on the top taskbar in the Ubuntu desktop.
Click "Terminal" to open a terminal window.
Type the following command at the Linux prompt and press the "Enter" key:
sudo passwd
To change the Administrator account password, the password of "root" is changed.
The "sudo" command gives the current user temporary Administrator access, in this instance, to change the password of "root."
First, the user will see a Unix prompt asking for the current user's password.
Type the user password for the current user account. Press the "Enter" key. Next, Unix will prompt the user for the new password for "root."
Type the new password for "root." Press "Enter." Finally, a Unix prompt will require a confirmation of the password.
Retype the new password for root, and press "Enter." The Administrator (root) account password for Ubuntu is now reset
or
Boot computer into recovery mode. Reset your computer and as it is booting, hold down the "Shift" key on your keyboard.
You will be presented with the boot menu.
Select "Recovery Mode" from the boot menu.
It is usually the the second boot option.
Wait for computer to boot up.
You will be presented with the Recovery Menu. Select "Drop to Root Shell Prompt."
Type "ls /home" and press "Enter." Note:
The command starts with a lower case L, not a capital i.
You will be presented with a list of usernames of accounts installed on the computer.
Type "passwd username" where username is replaced by the name of the account you want to reset. For example, if the username of your account was "jeff" you would type "passwd jeff" and press "Enter." You will be prompted to create a new password.
Enter a new password of your choosing.
Note: You will see no visual response when you type in your newly selected password; however, the computer still will register the input. Press "Enter."
You will be asked to retype your password.
Re-enter the same password and press "Enter."
Your password is now reset.
Type "Exit" to return to the boot menu and select "Resume Normal Boot" to restart Ubuntu.
hope this helps
During the boot up process you will see on the screen for a short amount of time press a certain key to enter set up
Press and hold that key during the boot up process to enter BIOS scroll down to set user password or supervisor password you can change or remove your password from there
hope this helps
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