This is a step by step guide on how to change your username on Debian, Ubuntu, Linux Mint (and other Linux distributions based on Debian/Ubuntu), and Fedora. The instructions explain how to change (rename) the username along with the user’s home folder name, as well as a simple work-around for potential issues with configuration files that still point to the old home folder name. There’s also a step for changing the full name (display name), which is shown on the login screen and other places throughout the desktop.