Problem in creating all default directories while adding a new user account in Ubuntu 12.04?

Problem in creating all default directories while adding a new user
account in Ubuntu 12.04?

I am facing a bizarre problem recently in Ubuntu 12.04 while adding a new
user. User adding command such as useradd -d /home/username -s /bin/bash
-m username in the terminal only creates a example-ubuntu folder in the
user's home but not the Downloads, Documents, Pictures, Music, etc.
Note that just before this, I had a problem with "login" probably due to
interrupted ubuntu updating. So, I fixed the problem by:
re-installing "ubuntu-desktop"
re-configuring "lightdm"
installing "unity and unity-2d" by searching Ubuntu blogs. Now login
problem is fixed, but useradd is not.
So, I would really appreciate any help in this matter if anyone knows.
Mahboob