useradd seems to have failed in Lubuntu 12.04 [duplicate]
Solution 1:
Rather than the low level utility useradd on a Debian based distribution (like Lubuntu) it is recommended to use adduser. This makes sure all defaults are installed correctly, and a user HOME is created appropriately.
Usage:
sudo adduser <username>
Solution 2:
Lubuntu has a graphical administration tool for this. Go to:
LXDE Menu > System Tools > Users and Groups
(Or, if you prefer, run the command users-admin.)