When working with Ubuntu on AWS, resetting the password can be a crucial task to regain access to your system. Here's a step-by-step guide on how to reset your Ubuntu AWS password:

1. First, log in to your AWS Management Console.
2. Go to the EC2 dashboard and select your instance running Ubuntu.
3. Click on the Actions dropdown menu and choose 'Instance Settings' and then 'Get System Log'.
4. In the system log, look for the line containing 'user password:', which will display the generated password.
5. Once you have the generated password, you can use it to log in to your Ubuntu instance.
6. It is recommended to change this temporary password to a secure one after logging in.

By following these steps, you can successfully reset your Ubuntu AWS password and regain access to your system.