In Ubuntu 13.04 and Ubuntu 13.10, displaying Username on Unity panel has disabled by default.
To add your Username on the Unity Panel, Open a Terminal (Alt + Ctrl + T) and paste the following commands.
If you want to remove the Username from the panel, do the following in Terminal.
To add your Username on the Unity Panel, Open a Terminal (Alt + Ctrl + T) and paste the following commands.
gsettings set com.canonical.indicator.session show-real-name-on-panel true
If you want to remove the Username from the panel, do the following in Terminal.
gsettings set com.canonical.indicator.session show-real-name-on-panel false
Enjoy..