我怎样才能找到我的用户名（ ubuntu 20.04 中的系统登录用户名）？
How can I find out my user name ( system login username in ubuntu 20.04 )?
如何在 Ubuntu 20.04.3 LTS 中找到我的系统登录用户名？
Use this solution if you didn't encrypt your home directory.
Do you still have the installation media(LiveCD/USB) from which you installed Ubuntu? Boot from it and select Try Ubuntu.
Go to Files and then, you will see you already installed Ubuntu partition. Click on it, it will mount.
Go to /home. Here you will see a list of all users on the system that you have created.
To jog your memory, however, what is your name? Did you enter the same name while installing Ubuntu? Do you recall the name that was displayed on the login prompt where you entered your password? Ubuntu by default sets the username as your first name in lowercase.
Example; name= John Doe, automatically set username= john
来源：https://askubuntu.com/a/704873
如何在 Ubuntu 20.04.3 LTS 中找到我的系统登录用户名？
Use this solution if you didn't encrypt your home directory.
Do you still have the installation media(LiveCD/USB) from which you installed Ubuntu? Boot from it and select Try Ubuntu.
Go to Files and then, you will see you already installed Ubuntu partition. Click on it, it will mount.
Go to /home. Here you will see a list of all users on the system that you have created.
To jog your memory, however, what is your name? Did you enter the same name while installing Ubuntu? Do you recall the name that was displayed on the login prompt where you entered your password? Ubuntu by default sets the username as your first name in lowercase.
Example; name= John Doe, automatically set username= john
来源：https://askubuntu.com/a/704873