User that does not use password to login needs it to run a command

Question

The user is set to login without a password. When trying to use that user to make a directory the user is asked to prvide a password. Since they don't have a password the system keeps rejecting them and denies them access to the command. Is there a default password that may be in use?

Answer 1

That the user can log in without providing a password, does not mean that the user does not have a password. It only means that the system does not require it, to let them in.

The answer to your last question is: No, there is no default password.

If you have another user on the same system, who knows their password and has sudo permissions, then they can change the password for the user who forgot theirs. Otherwise, you should proceed with a password recovery procedure, one of which is described in this post: Psychocats - How to reset your password in Ubuntu.

There is also mention of recovery by dropping to single user mode in the Ubuntu Community Documentation - Lost Password