Reset Ubuntu user password

An unmodified Ubuntu livedc should let you log in with the username ubuntu, and a blank password. If that doesn't work, the steps given should be fine.

If you are using a Persistent install you can go to Settings / Details / Users, and create your own user account and specify your own password.

Yes, the default username is ubuntu and password is ubuntu. As others have noted you need to wait a couple of minutes after boot as the user does not exist ...

All the Ubuntu flavors have the same username and password for every version. All version of the base flavor has the same username and password.

In the latest 22.04 versions of Ubuntu, the username is the same as the computer name. The password is blank.

The option “Try Ubuntu Mate” will take you to a live session that will not require a password, or not suppose to. If you selected the option to ...

Short answer – none. The root account is locked in Ubuntu Linux, so there is no default root password and you don't need one.

You're on tty3, press CTRL+ALT+F1 to return to GUI login. CTRL+ALT+F2 may even work if you're already logged.

It asked for a username and password upon installation, and then would reject the exact same username and password after installation.