How do I force a password in Linux?

Using passwd command

Another way to force user for password change is to use the command passwd with -e option. The -e option expires the current user password forcing user to set a new one on next login. From the man page of passwd command : -e This is a quick way to expire a password for an account.

How do I stop Linux from asking for a password?

Disable the Password Under Linux

To disable the password requirement, click on Application > Accessories > Terminal. Next, enter this command line sudo visudo and press enter. Now, enter your password and press Enter. Then, search for %admin ALL=(ALL) ALL and replace the line by %admin ALL=(ALL) NOPASSWD: ALL.